题目内容

It is known to all that the day becomes shorter and shorter winter comes.

A. before B. when C. until D. since

B 【解析】句意:众所周知,当冬天到来时,白天变得越来越短。A. before“在……之前”;B. when“当……时候”;C. until“直到……为止”;D. since“既然;由于”。结合句意,故选B。
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