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【题目】Ladies and gentlemen, please fasten your seat belts. The plane __________.

A. takes off B. is taking off

C. has taken off D. took off

【答案】B

【解析】句意:女士们,先生们,请系好安全带,飞机就要起飞了。表位移或起止的动词或动词短语,用现在进行时表将来。

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