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- 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?-

— 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

标签：lightsplaneoffbeforepractice

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