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