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    精英家教网 > 高中英语 > 题目详情

    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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