--- Do you know the reason pilots turn off the plane’s lights before taking off? ---The

问题补充：

--- 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：

A. why; for fear that

(答案→)B. for which; in case of

C. how; for fear of

D. that; in case

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