问题
选择题
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
答案：B
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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：B