- Do you know the reason pilots turn off the plane's lights before taking off?-
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— 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
试题答案
B