2. 外语
  3. He______have completed his work; otherwise, he wouldn’ t be enjoying himself by the seaside.

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

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问题 He______have completed his work; otherwise, he 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 本题考查情态动词+have done的用法。should have done sth．表示“本应该做某事，但并没做”。must have done sth．表示对过去事情的肯定推测，意为“一定已经做了某事”。wouldn’t have done是虚拟语气，表示对过去事情的假设，意为“本来不会做”。can’t have done表示对过去事情的否定推测，意为“不可能做过某事”。根据句意B项意思最合适，故选B。句意为：他一定已经完成了他的工作，不然他不会去海边玩的。
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