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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:他们的答案一模一样——他的当中一个人一定抄袭了另一个人。根据句意,抄袭这个动作发生在过去,排除A,C两项,B过去一定做了某事D本应该做某事而实际没做,故选B

考点:考查情态动词。

点评:情态动词+have done ,表示对过去的虚拟或推测。记住这些结构的意思:shouldn’t have done 本不应该做某事,实际上却做了;needn’t have done本不需要做某事,实际上却做了。can’t/couldn’ t have done不可能做了某事,

 

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