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    【题目】He________have completed his work; otherwise, he wouldn't be enjoying himself by the seaside.

    A．should

    B．must

    C．wouldn't

    D．can't

    【答案】B

    【解析】must have done是对过去事情的肯定推测“一定干了某事”。根据句子后部分可知他一定是干完了工作。

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