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题目
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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

答案
B
解析
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。
核心考点
试题【All passengers ______ are expected to fasten the seat belts when the plane takes】;主要考察你对介词和介词短语等知识点的理解。[详细]
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