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

A．on board; until B．a(chǎn)broad; since C．on the board; before D．a(chǎn)board; when

D

解析試題分析：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。
考點：考查副詞和連詞

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