All passengers _______, please fasten your seat belts and remain seated _______ the plane is landing.
A．on board; untilB．a(chǎn)broad; sinceC．on the board; beforeD．a(chǎn)board; when
D

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