Question

【题目】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

Answer 1

【答案】A

【解析】

考查介词短语。A. on board在船（车或飞机）上；C. on the board在董事会上；在木板上。B、D短语错误。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。故选A。