It is known to all that the day becomes shorter and shorter winter comes.
A. before B. when C. until D. since
答案
B
【解析】考查连词辨析。句意：众所周知，当冬天到来时，白天变得越来越短。before“在……之前”；when“当……时候”；until“直到……为止”；since“既然；由于”。结合句意，故选B。
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