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Their answers are exactly the same. One of them ___ from the other.
A．must copyB．must have copiedC．should copyD．should have copied
B

試題分析：句意：他們的答案一模一樣，一個(gè)人一定是抄襲另外一個(gè)人的。根據(jù)句意是對(duì)過(guò)去的情況的肯定推測(cè)，首先排除AC，因?yàn)樗鼈兪潜硎粳F(xiàn)在情況，must have done過(guò)去一定做了，should have done過(guò)去本應(yīng)該做而沒(méi)做，選B。
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