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

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 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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