问题补充：
Ladies and gentlemen, please fasten your seat belt. The plane .
A. takes off
B. is taking off
C. has taken off
D. took off
答案：
A. takes off
(答案→)B. is taking off
C. has taken off
D. took off
解析：根据句意可知句子叙述的是正在发生的事情，故用现在进行时，选B，飞机正在起飞。
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