He ____ have finished his work; Otherwise, he would．not be enjoying himself by the seaside．
A．shouldB．mustC．couldn’tD．can’t
B
考查情態(tài)動(dòng)詞表推測(cè)的用法。must have done 表示對(duì)過去事情肯定的推測(cè)，用于肯定句中，句意：他一定完成工作了，否則的話他就不會(huì)再海邊玩的這么高興了。所以選B。
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