All passengers please fasten your seat belts and remain seated the plane is landingA. o

问题补充：

All passengers , please fasten your seat belts and remain seated the plane is landing．

A. on board; until

B. abroad; since

C. on the board; before

D. aboard; when

答案：

A. on board; until

B. abroad; since

C. on the board; before

(答案→)D. aboard; when

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