He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
A．shouldB．mustC．wouldn’tD．can’t
B
此處考查情態(tài)動詞表示推測的用法。should have done表示過去應(yīng)該做而實際并沒有做，因此淘汰A項。would不用來表推測，因此淘汰C項。B基與D項雖然都可以表示推測，但B項表肯定意義而D項表示否定推測，意為“不可能”，根據(jù)句意：他肯定已完成了他的工作；不然，他就不會在海邊玩得那么愉快了。可知此處需要肯定意義，因此淘汰D項。
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