问答题礼堂里一个人都没有，会议一定是延期了。(must have been done)
问答题
礼堂里一个人都没有，会议一定是延期了。(must have been done)
参考解析
解析：
(not a soul一个人也没有。put off推迟，延期。
(not a soul一个人也没有。put off推迟，延期。
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