He______ (一定已经完成了工作); otherwise, he wouldn’t be enjoying himself by the seaside.

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问题 He______ (一定已经完成了工作); otherwise, he wouldn’t be enjoying himself by the seaside.

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答案 must have completed his work

解析 ①表示对过去动作的肯定推测时，谓语用must have done来表示；②“完成”可译为complete／finish。

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