— 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 _______

◎ 题干

— 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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◎ 解析

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◎ 知识点

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