Ladies and gentlemen please fasten your seat belt. The plane . A. takes offB. is taking o

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。