He ______ have finished his work; otherwise, he wouldn’t be enjoying himself by the seaside.
A．shouldB．mustC．needD．can
B
考查情態(tài)動詞表推測的用法。句意“他一定已經(jīng)完成作業(yè)了，不然，他他不可能正在海邊玩。”should have done“本應(yīng)該做某事”；must have done“一定已經(jīng)做了某事”；can have done“可能已經(jīng)做了某事”。本題表肯定的推測。故選B。
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