Ladies and gentlemen, please fasten your seat belts. The plane         . 
A．takes offB．is taking offC．has taken offD．took off
B
考察時態(tài)�，F(xiàn)在進行時表示即將要發(fā)生的事情，A項現(xiàn)在時指按照安排要發(fā)生的事情。結合句意可知B正確。句意：女士們先生們，請系好安全帶，飛機馬上就要起飛了。
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