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He ____ have finished his work; Otherwise, he would.not be enjoying himself by the seaside.
A.shouldB.mustC.couldn’tD.can’t
B
考查情态动词表推测的用法。must have done 表示对过去事情肯定的推测,用于肯定句中,句意:他一定完成工作了,否则的话他就不会再海边玩的这么高兴了。所以选B。
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