All passengers are expected to fasten the seatbelts when the plane takes off and lands. A. on t——青夏教育精英家教网—

摘要： All passengers are expected to fasten the seatbelts when the plane takes off and lands. A. on the board B. on board C. on a board D. on boards

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All passengers are expected to fasten the seatbelts when the plane takes off and lands.

A. on the board B. on board C. on a board D. on boards

All passengers are expected to fasten the seatbelts when the plane takes off and lands.

A. on the board B. on board C. on a board D. on boards

All passengers 　　 are expected to fasten the seatbelts when the plane takes off and lands.

A. on the board　　　　　　 B.on board?　　 C.on a board　　　　 D.on boards

A. on the board　　　　　　 B.on board?　　 C.on a board　　　　 D.on boards

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