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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1330

--- Do you know the reason _________ pilots turn off the plane’s lights before taking off?
---The practice is for the passengers to adjust to the dark _________ an emergency.

A.why; for fear that B.for which; in case of
C.how; for fear of D.that; in case
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Doyouknowthereasonpilotsturnof