He______ his work, otherwise, he wouldn’t be enjoying himself by the seaside.

A．must have completed B．should have completed
C．ought to complete D．must complete

A

解析試題分析：句意：他一定是完成了他的工作，否則他不會在海邊玩得那么開心。A. must have completed對過去的肯定推測；B. should have completed本應(yīng)該完成，實(shí)際上沒完成；C. ought to complete應(yīng)該完成；D. must complete必須完成。表示對現(xiàn)在的推測。故選A。
考點(diǎn): 考查情態(tài)動詞表推測的用法。

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