问题 选择题

— 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

答案:B

单项选择题
单项选择题