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

試題分析:句意：女士們先生們，請系好安全帶。飛機(jī)馬上要起飛了。Be doing 可以表示最近的將來，常用的動(dòng)詞有come ，go， leave，take off 等，根據(jù)句意可知用將來時(shí)態(tài)，選B。
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