题目内容


Their answers are exactly the same — one of them ______ from the other.
A．must copyB．must have copied
C．should copyD．should have copied
B
考查情态动词。must have done 表示对过去事情肯定的推测，句意：他们的答案确切的说是一样的。------他们当中的一个人一定抄了另一个人的。所以选B。
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