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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

試題分析：句意：所有機上的乘客，請系好安全帶，當飛機著陸額時候仍然要坐著。on board 在此處相當于aboard，表示"在飛機上"。第二個空填when，指當飛機著陸的時候。選D。

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