All passengers ____, please fasten your seat belts and remain seated ____the pla

题干

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

上一题下一题 0.85难度单项选择更新时间:2010-09-28 02:42:21

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