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Their answers are exactly the same — one of them ______ from the other.

A.must copy

B.must have copied

C.should copy

D.should have copied

 

【答案】

B

【解析】句意:他們的答案一模一樣——他的當(dāng)中一個(gè)人一定抄襲了另一個(gè)人。根據(jù)句意,抄襲這個(gè)動(dòng)作發(fā)生在過去,排除A,C兩項(xiàng),B過去一定做了某事D本應(yīng)該做某事而實(shí)際沒做,故選B

考點(diǎn):考查情態(tài)動(dòng)詞。

點(diǎn)評(píng):情態(tài)動(dòng)詞+have done ,表示對(duì)過去的虛擬或推測(cè)。記住這些結(jié)構(gòu)的意思:shouldn’t have done 本不應(yīng)該做某事,實(shí)際上卻做了;needn’t have done本不需要做某事,實(shí)際上卻做了。can’t/couldn’ t have done不可能做了某事,

 

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What time is it? Most people are pretty accurate in their answer. And if you don’t know for sure, it’s a very likely that you can find out. There may be a watch on your wrist, there may be a clock on the wall, desk, or computer screen; or maybe you’re riding in a car that has a clock in the dashboard (儀表板).
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