【題目】He________have completed his work; otherwise, he wouldn't be enjoying himself by the seaside.

A．should

B．must

C．wouldn't

D．can't

【答案】B

【解析】must have done是對過去事情的肯定推測“一定干了某事”。根據(jù)句子后部分可知他一定是干完了工作。

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