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
考查短語搭配。句中on board為“在飛機(jī)上”之意。句意：當(dāng)飛機(jī)起飛和降落的時(shí)候，所有的乘客都要求系上安全帶。
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