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All passengers _______, please fasten your seat belts and remain seated _______ the plane is landing.

A.on board; until B.abroad; since C.on the board; before D.aboard; when

D

解析试题分析:句意:所有机上的乘客,请系好安全带,当飞机着陆额时候仍然要坐着。on board 在此处相当于aboard,表示"在飞机上"。第二个空填when,指当飞机着陆的时候。选D。
考点:考查副词和连词

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