All passengers ________ are expected to fasten the seat belts when the plane takes off and lands. A....
2022-09-18 12:21:44 21次 江苏省2019届高三上学期期初调研测试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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