题目内容
(·黑龙江省哈三中高三上月月考) 35. --- 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
B
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