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Ladies and gentlemen,please fasten your seat belts.The plane( ) A.takes off B.is taking off c.hastaken off D.took off

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Ladies and gentlemen,please fasten your seat belts.The plane( ) A.takes off B.is taking off c.hastaken off D.took off
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答案和解析
B.
is 加瞬间动词的进行时态可表示将要如何