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    He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside．

    A．shouldB．mustC．wouldn’tD．can’t

    B

    解析试题分析：must have done表示对于过去动作所做的确定的推断，意为“（过去）一定做了某事”。根据He wouldn’t be enjoying …推断，他一定完成了工作。should have done表示“（过去）该做某事而没有做”；wouldn’t have done表示“（过去）实际上做了某事”； can’t have done表示对于过去动作否定的推断，意为“（过去）不可能做了某事”。故答案为A.
    考点：情态动词的推断用法。

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