摘要： on board 在车/船/飞机上 on the boards 当演员 on the board 在那块木板上
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All the 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
With the plane ,some passengers on board feel sick and want to throw up.
A、taken off B、taking off C、to take off D、would take off
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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