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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1451

All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.

A.to be cancelled B.were cancelled
C.have been cancelled D.having been cancelled
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Allflightsowingtotheheavyfog,m