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

試題分析：考查情態(tài)動詞：句意：所有的乘客在坐下來后都要系好安全帶。在飛行中不管系好安全帶的燈是否是亮的安全帶都要扣緊。Shall可以用于第二，三人稱，表示“規(guī)定，命令，警告，允諾”，這里指航空公司的規(guī)定，might可能，need需要，would愿意，過去常常，選A。
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