All mobile phones must be turned off from when the aircraft doors are closed _

游客2025-06-11 5

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

解析词汇题。until意为“在……之前”；unless意为“除非”；before意为“在……之前”；when意为“当……时候”。本题中，空格处有“直到”的含义，只有until符合题意。故选A。

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Allmobilephonesmustbeturnedofffromwhentheaircraftdoorsareclosed_