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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1043

Many air flights _________because of the eruption of the volcano, in _______case, many passengers had no choice but to take a train.

A.had been cancelled; which B.have been cancelled; what
C.had been canceling; that D.have been canceling; where
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Manyairflightsbecauseoftheerup