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 |
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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 |