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考研英语完型填空练习题及答案（通用5套）
在学习、工作生活中，我们最不陌生的就是练习题了，只有多做题，学习成绩才能提上来。学习就是一个反复反复再反复的过程，多做题。一份好的习题都是什么样子的呢？下面是小编收集整理的考研英语完型填空练习题及答案，供大家参考借鉴，希望可以帮助到有需要的朋友。
考研英语完型填空练习题及答案 1
About 40 percent of Americans think of themselves as shy, while only 20 percent say they have never suffered from shyness at some point in their lives. Shyness occurs when a person’s apprehensions are so great that they 1 his making an expected or desired social response. 2 of shyness can be as minor as 3 to make eye contact when speaking to someone, 4 as major as avoiding conversations whenever possible.
“Shy people tend to be too 5 with themselves,” said Jonathan Cheek, a psychologist, who is one of those at the forefront of current research on the topic. “ 6 , for a smooth conversation, you need to pay attention to the other person’s cues 7 he is saying and doing. But the shy person is full of 8 about how he seems to the other person, and so he often 9 cues he should pick up. The result is an awkward lag in the conversation. Shy people need to stop focusing on 10 and switch their attention to the other person.”
11 , shy people by and large have 12 social abilities than they think they do. 13 Dr. Cheek videotaped shy people talking to 14 , and then had raters (评估者) evaluate how socially skilled the people were, he found that, in the 15 of other people, the shy group had few 16 problems. But when he asked the shy people themselves 17 they had done, they were unanimous in saying that they had been social flops (失败).
“Shy people are their own 18 critics,” Dr. Cheek said. 19 he added, shy people feel they are being judged more 20 than they actually are, and overestimate how obvious their social anxiety is to others.
1. [A] prevent[B] inhibit[C] keep[D] motivate
2. [A] Symptoms[B] Signals[C] Highlights[D] Incidences
3. [A] succeeding[B] failing[C] acting[D] responding
4. [A] but[B] not[C] or[D] nor
5. [A] preoccupied[B] absorbed[C] engaged[D] indulged
6. [A] However[B] Then[C] For example[D] Instead
7. [A] that[B] which[C] what[D] how
8. [A] worries[B] feelings[C] emotions[D] indiffferences
9. [A] follows[B] picks up[C] misses[D] catches
10.[A]the conversation[B] shyness[C] others[D] themselves
11. [A] Therefore[B] Nevertheless[C]On the contrary[D] Similarly
12. [A] worse[B] as good[C] better[D] best
13. [A] When[B] Since[C] While[D] As
14. [A] themselves[B] friends[C] strangers[D] others
15. [A] name[B] terms[C] ease[D] eyes
16. [A] oblivious[B] obvious[C] oblique[D] obscure
17. [A] what[B] whatever[C] how[D] however
18. [A] best[B] justice[C] fair[D] worst
19. [A] In particular[B] In contrast[C] In general[D] In comparison
20. [A] positively[B] negatively[C] subjectively[D] objectively
参考答案
1. 【答案】B
【解析】 inhibit意为“阻止，抑制”，后面可直接跟名词或动名词，如：Thirst inhibits the desire to eat.口渴妨碍食欲。而prevent，keep虽也意为“阻止”，但常用结构为prevent/keep sb.from doing sth.因此这里inhibit为最佳选项。
2. 【答案】A
【解析】symptom意为“症状，病症”，在文中的意思是“害羞的症状就是……”。
3. 【答案】B
【解析】fail to do sth.不能做某事，句意为：害羞的人不能在与别人交谈时与别人进行眼神交流。因此，B项最合逻辑。
4. 【答案】C
【解析】or表示一种选择关系，根据上句...can be as minor as. . .，“可能微小到……”，又根据后面的as major as...，“能大到……”，由此可知应是一种选择关系，因此用or。
5. 【答案】A
【解析】preoccupied意为“心事重重的;关注于……的”，此句意为：害羞的人趋于对他们自己过分关注
6. 【答案】C
【解析】因为前面提出一个观点，害羞的人往往过分关注自己，这里便举例证明这个观点，因此C项为最佳选项。
7. 【答案】C
【解析】注意前面出现的cues，这个词意为“(言词、行为之)暗示，提示”。因为后面一句是用来解释说明cues的，因此应选What he is saying and doing.他在说什么话和做着什么动作。
8. 【答案】A
【解析】根据前面提出的观点，应知此句意为：害羞的人过分担心自己在他人眼中是什么样的，他们为自己的形象忧心重重。因此，选用worries最合文意。
9. 【答案】C
【解析】此句意为：正因为害羞的人过分关注他人对自己的看法，往往会错过别人的话语和小动作。根据文意，miss最合文意。
10. 【答案】D
【解析】前面提到，害羞的人是趋于关注“自己”的，因此，此处应选用themselves。
11. 【答案】B
【解析】根据后一句，害羞的人的'社交能力往往比他们自己想的要强，与前文谈害羞的人的缺点相比，可知这里有一个转折语气，nevertheless可引起转折语气，相当于but。
12. 【答案】C
【解析】此句意为：害羞的人有着比他们所想象的要强的社交能力。
13. 【答案】A
【解析】这里需要的是一个引导时间状语从句的词，句意为：当Cheek博士摄下害羞的人与他人谈话的情景时。
14. 【答案】C
根据逻辑，选择strang
er，与陌生人谈话为最佳选项。
15. 【答案】D
【解析】in the eyes of sb.意为“在某人看来”;in the name of sb.意为“以某人的名义”。根据上下文，选用eyes最合逻辑。
16. 【答案】B
【解析】obvious意为“可看出来的，显而易见的”;oblivious意为“”忘却”;obscure意为“模糊的”;oblique意为“间接的，斜的”。
17. 【答案】C
【解析】根据上下文，此句意为：研究者问了别人对害羞者行为的评价后，又问他们自己觉得自己表现怎么样。因此选用how最合适。
18. 【答案】D
【解析】根据前文，害羞者总是觉得自己表现不好，因此选用worst，句意为：害羞的人是对他们自己评论最差的人。
19. 【答案】C
【解析】in general意为“总体上来说”;in particular意为“具体而言”;in contrast意为“相比而言”;in comparison意为“比较地说”。
20. 【答案】B
【解析】negatively意为“否定地，消极地”;positively意为“肯定地”;subjectively意为“主观地”;objectively意为“客观地”。此题句意为：害羞的人趋于对自己有否定的评价。应选B项。
考研英语完型填空练习题及答案 2
Things in the henhouse changed practically overnight when McDonald’s announced in 1999 that it would no longer buy eggs from producers who didn’t meet its guidelines for care of chickens. Those guidelines included limiting the 1 of birds that could be kept in one 2 and prohibiting beak removal, 3 trimming just the tips.
Once McDonald’s had 4 the way in issuing animal care guidelines for the company’s suppliers, many other giants of the fast-food industry rapidly followed 5 , including Burger King, Taco Bell, Pizza Hut, Wendy’s, A and W and KFC. Now, the American Meat Institute has 6 welfare guidelines and audit 7 for cattle, pigs, and chickens. And the European Union, representing our foreign customers, is also 8 in with, among other things, legislation banning. 9 use of crates to house pregnant sows, 10 in 2013.
Questions about animal care 11 with the explosive growth in large-scale livestock farms, 12 spurred customers to complain about animals being treated as “factory parts”. That spurred ARS and the livestock industry to take a proactive approach to addressing animal 13 issues, making sure that guidelines are based on facts 14 through scientific research. The goal is to share research findings with the retail food industry and others so that the livestock industry can improve its 15 guidelines.
Ten years ago, to 16 these concerns, ARS started a research program on livestock behavior and stress. The scientists involved were tasked with finding out whether modern farming practices were 17 stressing animals. And if so, could scientific methods be developed to measure this stress so that 18 could be evaluated objectively rather than subjectively?
A decade later, the 19 answer is “yes” to both questions, Many had expected the answer to be “no” on both counts, but science works independently 20 people’s opinions.
1. A. amount B. number C. figure D. sum
2. A. cage B. cave C. case D. cart
3. A. but for B. except for C. aside from D. away from
4. A. paved B. changed C. led D. opened
5. A. suitB. step C. set D. super
6. A. adapted B. adopted C. approved D. accepted
7. A. booklets B. pamphlets C. brochures D. checklists
8. A. measuring B. weighing C. considering D. thinking
9. A. prolonged B. proceeded C. programmed D. progressed
10. A. efficient B. effective C. effusive D. elective
11. A. raised B. roseC. aroseD. pose
12. A. who B. what C. which D. how
13. A. health B. life C. wealth D welfare
14. A. decided B. determined C. proved D. tested
15. A. voluntary B. revolutionary C. preliminary D. necessary
16. A. express B. address C. suppress D. compress
17. A. unduly B. unequally C. unfortunately D. unfavorably
18. A. performances B. programs C. problems D. practices
19. A. sequential B. initial C. essential D. financial
20. A. of B. on C. by D. with
1.【答案】B
【解析】amount指不可数名词的“数量”，number指可数名词的“数目”，figure指一个“数字”，sum多指钱的“数量”。这里指家禽数目，是可数名词，因此答案是B。
2.【答案】A
【解析】cage意为“笼子”，是和文中的bird搭配唯一恰当的词，cave“洞穴”，case“箱子”和cart“人力车”都不可和bird搭配使句意通畅，所以选A。
3.【答案】B
【解析】but for是“若非，要不是”，except for是“除了，只是”，aside from是“除…以外”，away from是“离开”。原文的意思是供应商除了可以对鸟喙尖部稍加修剪外禁止去掉鸟喙。只有except for符合句子意思，因此B是正确答案。
4.【答案】C
【解析】pave the way是“为…作准备”，change the way是“改变…方式、方法”，lead the way是“为…之先，首先倡导”，open则不能和the way搭配。根据上下文可知麦当劳公司在家禽饲养方面率先作出明确规定，其后诸多快餐巨头纷纷效仿，因此答案是C。
5.【答案】A
【解析】“效仿，模仿”在英语里的固定短语是follow suit，所以选A。
6.【答案】B
【解析】adapt是“适应”，adopt是“采纳”，approve是“同意”，accept是“接受，同意”。首先排除adpat，而approve和accept意思相近，属于干扰选项，所以答案是B。提醒大家准确记忆adapt和adopt的拼写及用法，这两个词在词汇测试方面的出现频率相当高。
7.【答案】D
【解析】本题我们可以采用排除法。A、B、C三个选项都是“小册子”的意思，不能同时成为正确答案，只能选D，checklist的意思是“(核对用的)一览表(尤指完整的清单)”。
8.【答案】B
【解析】weigh in with是固定短语，意为“(在讨论等中)有把握地提出”。Consider，think和measure都不能和in with搭配，所以答案是B。
9.【答案】A
【解析】这四个选项相似之处在于它们有相同词头“pro”。prolong的意思是“拖延，延长”，
proceed的意思是“进行，继续”，program为“设计，规划”之意，而progress则为“进步，发展”之意。只有prolong的`过去分词能修饰use，因此只能选择A。
10.【答案】B
【解析】C，D选项易排除，effusive为“感情横溢的，流出的”，elective意思是“有选举权的，被选任的，可选修的”。A、B选项也是考试高频词汇，它们不仅拼写相似，意思也有相近之处，effective意思是“生效的，有效的”，而efficient是“效率高的，能干的，有效的”之意，法律条文的生效一般用effective，所以选B。
11.【答案】C
【解析】本句主干是“Questions+待选谓语动词”，意思是伴随着大规模家畜饲养场的发展出现了许多问题。我们先排除raised和posed，因为它们与question搭配时都作及物动词。rise为“升起，增长”之意，arise的意思是“出现，发生”，只有arise能作不及物动词和question搭配，因此C为正确答案。
12.【答案】C
【解析】解这道题时，首先要理清句子结构。逗号后面的句子应为非限制性定语从句，修饰前面整句话，待选词应为引导定语从句的关系代词，据此可排除what和how，又因为这个定语从句修饰的不是人，who也被排除。正确答案只能为C.
13.【答案】D
【解析】health是“健康”，life是“生命，生存”，wealth是“财富”，welfare是“福利”。从上文可以看出，本文讨论的是针对动物的福利提出的一些饲养动物的规定，因此D是正确答案。
14.【答案】B
【解析】decide是“决定，使下决心”，determine是“决定，确定，测定”，prove是“证明，证实”，test是“试验，测验”。要填的过去分词修饰的是fact，最合适的选项是determined，因此答案是B。
15.【答案】A
【解析】voluntary意思是“自发的，自愿的”，revolutionary为“革命的”，而preliminary为“预备的，初步的”，necessary则为“必须的，必需的”。从上文可以看出，这些guidelines(指导原则)是由家畜饲养行业自发制定的，而与食品零售行业和其他行业共享研究结果的目的是完善这些指导原则，因此A为正确答案。
16.【答案】B
【解析】express是“表达，表示”，address是“对付，处理”，suppress是“压制，镇压”，compress是“压缩，镇压”。express和address能和concerns搭配，但这句话的主语是ARS，不定式短语表示目的，即ARS开始实验的目的，显然address更合适，所以选B。
17.【答案】A
【解析】大家可用构词法知识对词义进行推测，duly为“适当地”，那么unduly应为“不适当地，过分地”之意，其他三个选项也可依此类推。根据句子意思判断，A为正确答案。原句意思是科学家想通过研究来验证现代的饲养方式是否对家畜形成过大的压力。
18.【答案】D
【解析】 performance是“表演，表现”，program是“规划，程序”，problem是“问题”，practice是“实践，行为，做法”。除了区别四个选项的意思之外，细心的同学会发现上句话中practice已经出现。从上下文中寻找正确答案是做完形填空题非常行之有效的技巧。D是正确答案。
19.【答案】B
【解析】sequential是“连续的”，initial是“最初的”，essential是“必不可少的”，financial是“金融的”。空格后搭配的是answer，A、C、D三个选项都可以排除，因此选择B。
20.【答案】A
【解析】 be independent of是固定短语，意为“不依赖于…”，原句意思是科学不以人的意志为转移，也就是说科学不依赖于人为因素。正确答案为A。
考研英语完型填空练习题及答案 3
Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is ___1___ only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, ___2___ embarrassed. You have to take a commuter train any morning or evening to ___3___ the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. ___4___, there is an unwritten but clearly understood code of behavior which, ___5___ broken, makes the offender immediately the object of ___6___.
It has been known as a fact that the a British has a ___7___ for the discussion of their weather and that, if given a chance, he will talk about it ___8___. Some people argue that it is because the British weather seldom ___9___ forecast and hence becomes a source of interest and ___10___ to everyone. This may be so. ___11___ a British cannot have much ___12___ in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong ___13___ a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate――or as inaccurate――as the weathermen in his ___14___.
Foreigners may be surprised at the number of references ___15___ weather that the British make to each other in the course of a single day. Very often conversational greetings are ___16___ by comments on the weather. "Nice day, isn"t it?" "Beautiful!" may well be heard instead of "Good morning, how are you?" ___17___ the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. ___18___ he wants to start a conversation with a British but is ___19___ to knowswheresto begin, he could do well to mention the state of the weather. It is a safe subject which will ___20___ an answer from even the most reserved of the British.
1. A. relaxed B. frustrated C. amused D. exhausted
2. A. yet B. otherwise C. even D. so
3. A. experience B. witness C. watch D. undergo
4. A. Deliberately B. Consequently C. Frequently D. Apparently
5. A. unless B. once C. while D. as
6. A. suspicion B. opposition C. criticism D. praise
7. A. emotion B. fancy C. likeliness D. judgement
8. A. at length B. to a great extent C. from his heart D. by all means
9. A. follows B. predicts C. defies D. supports
10. A. dedication B. compassion C. contemplation D. speculation
11. A. Still B. Also C. Certainly D. Fundamentally
12. A. faith B. reliance C. honor D. credit
13. A. if B. once C. when D. whereas
14. A. propositions B. predictions C. approval D. defiance
15. A. about B. on C. in D. to
16. A. started B. conducted C. replaced D. proposed
17. A. Since B. Although C. However D. Only if
18. A. Even if B. Because C. If D. For
19. A. at a loss B. at last C. insgroups D. on the occasion
20. A. stimulate B. constitute C. furnish D. provoke
参考答案
1. A 2.C 3.B 4.D 5.B 6.C 7.B 8.A 9.A 10.D
11. C 12.A 13.C 14.B 15.D 16.C 17.B 18.C 19.A 20.D
考研英语完型填空练习题及答案 4
Here is another program in the series, "Famous Personalities (个性)." This afternoon I am going to talk (1)____ the famous film director, Daniel Z. Sloman. Dan Sloman doesn’t need any introduction from me. He has directed "Goodbye to Boston", "Pacific Story" and many other famous films. "Tell me, Dan, have you ever directed a film in England?"
"Why, yes, Peter. I directed ’Green Years’ here."
"Oh course. How long (2)____ was that, Dan?"
"That was five years ago. That film was about life in an English village."
"What can you remember about this (3)____, Dan?"
"Lots of things, Peter. When we were filming in the open, it usually (4)____ to rain!"
"You rebuilt half the village, I believe, Dan."
"That’s right, Peter. We built a (5)____ over the river. We put a few buildings. (6)____ our men were working, half the (7)____ watched us."
"Were the villagers against the film?"
"Oh, no. Many villagers (8)____ a lot of money. Thousands of tourists came to the village. The place (9)____ famous."
"Have you ever been back to the village since then?"
"I can’t say I have, Peter. But I remember it well."
"What else do you remember about the film, ’Green Years’, Dan?"
"Well, I remember the actors, of course. In one scene we (10)____ a thousand ’extras’."
"And you used the villagers."
"That’s right, Peter. There were 2000 men, women and children in the village and we used a thousand of them. Every man has his price. We paid each villager fifty pence to take part in the film."
"What about the villagers that weren’t in the film?"
"They came to watch."
"What happened then?"
"It was very funny, Peter. We couldn’t keep them out of it. We paid half the villagers fifty pence each to act in the film. And we paid the other half of the villagers five pounds each not to join in the film! But it was a great scene. I’ll never forget it."
"Thank you, Dan."
1. A. to B. about C. for D. into
2. A. before B. ago C. after D. since
3. A. life B. village C. year D. film
4. A. begins B. began C. had started D. beginning
5. A. road B. way C. village D. bridge
6. A. As soon as B. After C. Before D. While
7. A. town B. city C. village D. country
8. A. made B. took C. carried D. brought
9. A. is B. gets C. became D. get
10. A. asked B. dismissed C. needed D. told
答案：1. A 2. B 3. D 4. B 5. D 6. D7. C 8. A 9. C 10. C
考研英语完型填空练习题及答案 5
A land free from destruction, plus wealth, natural resources, and labor supply—all these were important 1 in helping England to become the center for the Industrial Revolution. 2 they were not enough. Something 3 was needed to start the industrial process. That "something special" was men—4 individuals who could invent machines, find new 5 of power, and establish business organizations to reshape society.
The men who 6 the machines of the Industrial Revolution 7 from many backgrounds and many occupations. Many of them were 8 inventors than scientists. A man who is a 9 scientist is primarily interested in doing his research 10 .He is not necessarily working 11 that his findings can be used.
An inventor or one interested in applied science is 12 trying to make something that has a concrete use. He may try to solve a problem by 13 the theories 14 science or by experimenting through trial and error. Regardless of his method, he is working to obtain a 15 result: the construction of a harvesting machine, the burning of a light bulb, or one of 16 other objectives.
Most of the people who 17 the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had 18 or no training in science might not have made their inventions 19 a groundwork had not been laid by scientists years 20 .
1.A.cases B.reasons C.factors D.situations
2.A.But B.And C.Besides D.Even
3.A.else B.near C.extra D.similar
4.A.generating B.effective C.motivating D.creative
5.A.origins B.sources C.bases D.discoveries
6.A.employed B.created C.operated D.controlled
7.A.came B.arrived C.stemmed D.appeared
8.A.less B.better C.more D.worse
9.A.genuine B.practical C.pure D.clever
10.A.happily B.occasionally C.reluctantly D.accurately
11.A.now B.and C.all D.so
12.A.seldom B.sometimes C.all D.never
13.A.planning B.using C.idea D.means
14.A.of B.with C.to D.as
15.A.single B.sole C.specialized D.specific
16.A.few B.those C.many D.all
17.A.proposed B.developed C.supplied D.offered
18.A.little B.much C.some D.any
19.A.as B.if C.because D.while
20.A.ago B.past C.ahead D.before
1.【答案】C
【解析】从这四个词的意思上来区分，case是“事例，案例”的意思，reason表原因，factor意为“因素”，situation的意思是“形势，状况”，文中句子的意思是上述条件是使英国成为工业革命中心的重要因素。故选C.factor。
2.【答案】A
【解析】根据上下句的意思，应选一个表转折的连词，只有A.but符合题意。
3.【答案】A
【解析】else意为“其他，别的”，如：What else can I say?别的我还能说些什么呢?extra意为“额外的，外加的”，如：an extra loaf of bread多加的一条面包，而这句话要表达的是“也需要其他条件”，而不是“额外条件”，排除C.extra。near和similar意思相差较远，故选A。
4.【答案】D
【解析】根据下句的解释，应选“有创造性的”，creative符合题意。generating (生的、生的)、motivating (有动机的)和effective(有效的)意思上不贴切。
5.【答案】B
【解析】sources意为“来源，根源”，如，sources of power意为“能源”。符合题意。origin的意思是“起因，由来”。如：the origin of a river河流的源头;base是“基础”的意思;discovery是“发现”的意思。
6.【答案】B
【解析】根据句子的意思，应选create“创造，发明”这个词。
7.【答案】A
【解析】come from的意思是“出自，来自”，与后面background搭配,意为“出于……背景”。stem from意为“起源于”，如：Her interest in books stems from her childhood.她对书本的兴趣是从童年开始的。B、C项的意思不对。
8.【答案】C
【解析】more…than…是固定搭配，意为“与其说……不如……”。本句的`意思是,“与其说是科学家,不如说是发明家”。
9.【答案】C
【解析】pure的意思是“纯粹的，单纯的”，genuine的意思是“真正的”，practical的意思是“实际的”，clever的意思是“聪明的”,句子的意思是“一个单纯的科学家主要致力于精确的科学研究。”
10.【答案】D
【解析】accurately的意思是“精确的”,符合题意。Happily(愉快的);occasionally(时而的，偶然的)和reluctantly(勉强的)均不合题意。
11.【答案】D
【解析】so that是固定搭配，表目的。
12.【答案】C
【解析】这句话的意思是“一个发明家或热衷于应用科学的人通常试图创造有使用价值的东西。”
13.【答案】B
【解析】这句话的意思是“通过运用科学理论”，use意为“使用,运用”,故选B。
14.【答案】A
【解析】theories of science的意思是“科学的理论”。
15.【答案】D
【解析】根据句子的意思，“他为了明确的结果而工作”，specific的意思是“明确的”,specialized的意思是“专门的”; sole的意思是“独有的，单一的”;single的意思是“单独的,一个人”。
16.【答案】C
【解析】根据题意，one of many other objectives“许多其他东西中的一种”。all,全部; few,几乎没有; those,那些;均不合题意。
17.【答案】B
【解析】develop (使)发展。如：to develop a business,发展业务。另一个意思是“研制、开发”，用在这里恰当。如：Many new products have been developed to meet the needs of the people.开发了许多新品以满足人们的需要。Propose建议。如：I propose resting for half an hour.我提议休息半个小时。Supply提供、供应。如：The government supplies free books to schools.政府为学校免费提供图书。Offer提供，出价。如：Will you offer the guests some coffee.你能给客人准备些咖啡吗?
18.【答案】A
【解析】本题要求选用的适与no意义相近的不定代词，在四个选项中，只有A) little的意思是“几乎没有”,后接不可数名词，符合题意。
19.【答案】B
【解析】本题要求填入的是一个连词，用来连接一个表示与过去事实相反的虚拟条件句。本句的意思是说：“如果没有科学家早年打下的基础，那些在科学上接受过很少或没有接受过教育的人就不可能有所发明创造”。if的意思是“如果，假使”，通常用在虚拟条件句中。
20.【答案】D
【解析】本题要求填入的副词用来修饰一个过去完成时的谓语动词，即表示过去某个时间以前发生的动作，因而只能用D)before。如：He would not have achieved so much in the research if he had not studied chemistry years before.如果他早年没学过化学的话，他在这项研究中就不可能取得这么大的成绩。Ago只与一般过去时连用，表示从现在角度看过去的某一时间。如：He studied chemistry many years ago.他好多年前学过化学。
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