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Passengers _____ fasten their seat belts immediately after taking their seats. The belts should remain buckled during the flight whether or not the “fasten seat belt” light is on.
A.shallB.mightC.needD.would
A

试题分析:考查情态动词:句意:所有的乘客在坐下来后都要系好安全带。在飞行中不管系好安全带的灯是否是亮的安全带都要扣紧。Shall可以用于第二,三人称,表示“规定,命令,警告,允诺”,这里指航空公司的规定,might可能,need需要,would愿意,过去常常,选A。
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