【題目】All passengers ________ are expected to fasten the seat belts when the plane takes off and lands.

A. on board B. on aboard

C. on the board D. on boards

【答案】A

【解析】

考查介詞短語。A. on board在船（車或飛機）上；C. on the board在董事會上；在木板上。B、D短語錯誤。句意：當飛機起飛和降落的時候，所有的乘客都要求系上安全帶。故選A。

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