He ______ have completed his work；otherwise, how wouldn’t be enjoying himself by

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问题 He ______ have completed his work；otherwise, how wouldn’t be enjoying himself by the seaside.

选项 A、should
B、must
C、wouldn’t
D、can’t

答案 B

解析 should have done sth. 表示“本应该做某事”。must have done sth.表示“一定已经完成了某事”。两种选择形式上都正确，主要根据句意判断，本句意思是：他一定是已经完成了他的工作，否则他不会去海边玩耍的。

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