Ladies and gentleman, please fasten your seat belts! The plane .
A. takes off
B. is taking off
C. has taken off
D. took off
网友回答
A. takes off
(答案→)B. is taking off
C. has taken off
D. took off
解析：考察时态，根据题意，先生们女士们，请系好你们的安全带 ！飞机要起飞了。瞬间动词的进行时态可表示将来发生的动作，故选B，要起飞了。