He _______ have completed his work；otherwise, he wouldn’t be enjoying himself by the seaside.
A．shouldB．must?
C．wouldn’tD．can’t?
B?
此題考查情態(tài)動詞must表推測的用法。must have done表示“對過去情況肯定的推測”，意為“一定發(fā)生了某事”。句意為“他一定完成了他的工作，否則他現(xiàn)在就不會在海邊開心的玩了”。
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