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  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 他肯定已经完成了工作，不然不会在海边玩的如此尽兴。考点：情态动词。should have done sth．表示本来该做而没有去做某事。must have done sth．表示对过去某事非常肯定的猜测，表示一定已经做了某事。wouldn’t have done sth．表示本不会做而做了某事。can’t have done表示以前不可能做某事。根据题干后半部分他正在海边尽兴的玩可以推测，工作一定已经完成了，因此选B。
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