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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：thefastenseatwhenbelts

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