题目内容

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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