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

A．shouldB．mustC．wouldn’tD．can’t

B

解析試題分析：must have done表示對(duì)于過去動(dòng)作所做的確定的推斷，意為“（過去）一定做了某事”。根據(jù)He wouldn’t be enjoying …推斷，他一定完成了工作。should have done表示“（過去）該做某事而沒有做”；wouldn’t have done表示“（過去）實(shí)際上做了某事”； can’t have done表示對(duì)于過去動(dòng)作否定的推斷，意為“（過去）不可能做了某事”。故答案為A.
考點(diǎn)：情態(tài)動(dòng)詞的推斷用法。

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