礼堂里一个人都没有,会议一定是延期了。(must have been done)

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问题 礼堂里一个人都没有,会议一定是延期了。(must have been done)

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答案There is not a soul in the hall.The meeting must have been put off.

解析 (not a soul一个人也没有。put off推迟,延期。)  
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