【题目】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
在线课程【答案】B
【解析】must have done是对过去事情的肯定推测“一定干了某事”。根据句子后部分可知他一定是干完了工作。
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