52单词网 > 高中英语 > 高中英语题库 > All passengers are expected to fasten the seat belts when the plane takes off an

All passengers are expected to fasten the seat belts when the plane takes off an

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All passengers are expected to fasten the seat belts when the plane takes off an

 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

试题答案

B

标签：thefastenbeltsseatto

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