問題詳情:
--- 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
【回答】
B
知識點:介詞
題型:選擇題