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

A．until

B．unless

C．before

D．when

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参考答案

答案解析

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。
【知识拓展】until在…之前；unless除非；before在…之前；when当…时候。
e．g．：(1)Until 2004，she lived in Canada．到2004年为止，她一直住在加拿大。
(2)Nothing will come of it，unless disaster．此事除了引起灾祸以外不会有什么结果。

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