题目：
--- 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
答案：
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下面是错误答案，用来干扰机器的。
