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大学英语A语法词汇
题目内容
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单选题
)
By the end of this year Mr. Smith ______ in our company for exactly three years.

A、is working

B、has worked

C、will work

D、will have worked

答案：D

解析：参考解析:动词时态。根据时间状语By the end of this year可以判断时间是将来，应该从C项和D项做出选择。同时，by引导时间状语时，句子时态一般是完成时态，所以选D。其他选项的时态都不可以与时间状语by the end of this year连用。句意:到今年年底，斯密斯先生在我们公司工作正好3年。本解析在2008年12月的试题中(Structure: Section 20)已经出现过，望考生加以注意。

大学英语A语法词汇
Scientists should be kept _________ of the latest developments in their research areas.
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It is becoming increasingly difficult to grow enough food to ________ much of the earth＇s population from starvation.
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There are three colors in the British flag, ____red, white and blue.
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You can＇t drink alcohol ________ you are at least eighteen years old in some states of the US.
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It is difficult for her to make the final decision now, _______ she is in a delicate situation.
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Laptops are now so expensive____beyond the reach of almost everyone.
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They will not start the project until the board chairman _______ back from South Africa.
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______ a river on land, an ocean current does not flow in a straight line.
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If I hadn＇t attended an important meeting yesterday,I ______ to see you.
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Fresh fruits and vegetables are generally less expensive when they are in _______.
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大学英语A语法词汇
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大学英语A语法词汇

By the end of this year Mr. Smith ______ in our company for exactly three years.

A、is working

B、has worked

C、will work

D、will have worked

答案：D

解析：参考解析:动词时态。根据时间状语By the end of this year可以判断时间是将来，应该从C项和D项做出选择。同时，by引导时间状语时，句子时态一般是完成时态，所以选D。其他选项的时态都不可以与时间状语by the end of this year连用。句意:到今年年底，斯密斯先生在我们公司工作正好3年。本解析在2008年12月的试题中(Structure: Section 20)已经出现过，望考生加以注意。

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大学英语A语法词汇
相关题目
Scientists should be kept _________ of the latest developments in their research areas.

A. inform

B. informing

C. informed

D. to inform

解析：参考解析:分词用法。分词的用法一般是现在分词表主动，过去分词表被动。本题中动词和主语的关系是:科学家是被告知的对象，是动作的接受者，所以要用被动形式，因此选过去分词informed。A项是动词原形，时态不符;B项informing语态不对;keep后面一般不用不定时，所以D项也不正确。句意:科学家们要通晓他们所在研究领域的最新发展。

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It is becoming increasingly difficult to grow enough food to ________ much of the earth＇s population from starvation.

A. prevent

B. defend

C. guard

D. preserve

解析：prevent预防
defend辩护; 保卫;
guard保卫; 守护
preserve保护

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There are three colors in the British flag, ____red, white and blue.

A. rarely

B. namely

C. really

D. naturally

解析：参考解析:本题考查连词用法。前面说"英国国旗有三种颜色”，后面接着给出了具体颜色，前后是一种解释说明的关系。namely的意思是"也就是说，具体来说"，符合题意。答案选B。句意:英国的国旗有红色、白色和蓝色三种颜色组成。

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You can＇t drink alcohol ________ you are at least eighteen years old in some states of the US.

A. if

B. unless

C. though

D. when

解析：参考解析:连词用法。unless相当于if not，意为"如果不，除非”，它引导条件状语从句时，主句常用否定形式。句意:在美国的一些州，除非你年满8岁，否则是不允许喝酒的。

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It is difficult for her to make the final decision now, _______ she is in a delicate situation.

A. if

B. unless

C. until

D. since

解析：参考解析:四个词中，只有since可以引导原因状语从句，表示"由于，因为"的意思，故选D。

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Laptops are now so expensive____beyond the reach of almost everyone.

A. that be

B. as to be

C. as be

D. as being

解析：参考解析:译文:现在笔记本电脑还很贵，不是人人都买得起。考点:固定搭配。”so+形容词/副词+as+不定式"属于固定搭配，表示”如此...以至于”，故选B。

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They will not start the project until the board chairman _______ back from South Africa.

A. will come

B. is coming

C. came

D. comes

解析：参考解析:句式结构。not until经常连用，意思是"直到......"。使用not until时要注意前后句子的时态，until表示的是一个时间点，主句用的是一般将来时，从句要用现在时，选D。A项、B项和C项在时态上均不符本题意思。句意:等董事会主席从南非回来，他们才会运作这个项目。

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______ a river on land, an ocean current does not flow in a straight line.

A. Alike

B. Like

C. Likewise

D. Likely

解析：参考解析:介词。like是介词，后面跟名词，意思是"像...一样"，表示方式，在句中作方式状语。句意:像陆地上的河流—样，洋流也不按直线流淌。

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If I hadn＇t attended an important meeting yesterday,I ______ to see you.

A. will have come

B. would have come

C. have come

D. had come

解析：参考解析:本题考查虚拟语气。前面的分句用的是过去完成时，表示对过去已经发生了的事情的假设，因此后面主句的谓语动词要用would have done的形式。正确答案为B。句意:如果昨天我不去参加—个重要会议，我就能来看你了。

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Fresh fruits and vegetables are generally less expensive when they are in _______.

A. need

B. season

C. time

D. sale

解析：in need在困难中、需要帮助/ in season应时的/ in time及时，适时地

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