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Their answers are exactly the same. One ...

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

 

B 【解析】 试题分析:句意:他们的答案一模一样,一个人一定是抄袭另外一个人的。根据句意是对过去的情况的肯定推测,首先排除AC,因为它们是表示现在情况,must have done过去一定做了,should have done过去本应该做而没做,选B。 考点:考查情态动词的完成式
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