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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 |
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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 |