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
解析:可联系答.案.网客服索取。
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