—How long have you worked in this hospit...

—How long have you worked in this hospital?

—________2015.

A.Before B.Since C.Then D.After

B 【解析】句意：——你在这所医院工作多久了？——自从2015年。考查时间介词辨析。Before在……之前；Since自从；Then然后；After在……之后。结合句意可知，询问的“你在这所医院工作多久了？”回答用since表示“自从”，表示过去某一动作从某一时间开始持续到现在。故选B。

考点分析：

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