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

问题补充：

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

A. on board; before

B. abroad; since

C. on the board; after

D. aboard; when

答案：

A. on board; before

B. abroad; since

C. on the board; after

(答案→)D. aboard; when

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