问题补充:
Ladies and gentlemen, please fasten your seat belts. 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:
此题答案选B,用现在进行时表示将来意义。The plane is taking off. 的意思是“飞机马上就要起飞了”。
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