问题
选择题
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
答案：B
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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：B