All mobile phones must be turned off from when the aircraft doors are closed_______ the doors open again on arrival.

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问题 All mobile phones must be turned off from when the aircraft doors are closed_______ the doors open again on arrival.

选项 A、until
B、unless
C、before
D、when

答案A

解析句意：机舱门一关闭，所有的手机都要关机，直到飞机抵达后舱门再次打开时。本题考查的是连词词义辨析。本题中，空格处有“直到”的含义，只有until符合题意。故A正确。

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