He____________havecompletedhiswork,

发布时间：2020-07-26 12:17:30

He ____________ have pleted his work, other wise, he wouldn't be enjoying himself by the seaside.A.shouldB.mustC.wouldn'tD.can't

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B解析据本句意思“他一定是已完成工作了；否则，他就不会在海边玩得那么高兴了。”可知是对过去发生的事情的肯定推测。故应选用must。
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