Ladies and gentlemen, please fasten your seat belts. The plane
A.takes offB.is taking offC.has taken offD.took off在线课程B
解析：
考察时态。现在进行时表示即将要发生的事情，A项现在时指按照安排要发生的事情。结合句意可知B正确。句意：女士们先生们，请系好安全带，飞机马上就要起飞了。
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