题目内容
All passengers ______ are expected to fasten the seat belts when the plane takes off and lands.
| A.on aboard | B.on board | C.on the board | D.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。
练习册系列答案
相关题目
题目内容
| A.on aboard | B.on board | C.on the board | D.on boards |