Itisknowntoallthatthedaybecomesshorterandshorter       ...

问题详情：

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

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

【回答】

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。

知识点：连词

题型：选择题