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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
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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
查看习题详情和答案>>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
查看习题详情和答案>>
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 |