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    All passengers ______ are expected to fasten the seat belts when the plane takes off and lands．
    A．on aboardB．on boardC．on the boardD．on boards
    B
    考查短语搭配。句中on board为“在飞机上”之意。句意：当飞机起飞和降落的时候，所有的乘客都要求系上安全带。
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