Ladies and gentlemen, please fasten your seat belts. The plane _______.
A．takes offB．is taking off
C．has taken offD．took off
B

此題答案選B，用現(xiàn)在進(jìn)行時(shí)表示將來意義。The plane is taking off. 的意思是“飛機(jī)馬上就要起飛了”。
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