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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1864

All flights______ because of the air traffic control, the passengers had to wait in the hall.

A.were put off B.having put off
C.having been put off D.have been put off
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相关知识点

Allflightsbecauseoftheairtraff