Due to the super typhoon Haiyan, all the flights were delayed or cancelled, so the conference had to...
2022-08-25 05:35:25 138次 江苏省2018-2019学年高二4月月考（含听力）英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Due to the super typhoon Haiyan, all the flights were delayed or cancelled, so the conference had to be ________.
A. put up B. put through C. put off D. put down
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