With a modal verb: He _______ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.

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问题 With a modal verb:
He _______ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.

选项

答案must

解析 must have done表示对过去的肯定推测,意为“肯定做过某事”,根据题干可知,句子所要表达的意思是“他肯定完成了工作,否则他不会在海边享乐”。答案为must。
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