题目内容

— Have you known each other for long?
— Not very long, ____ we started to work in the company.
A.afterB.beforeC.whenD. since
D。
since 是从属连词,引导时间状语从句,常与现在完成时连用。题中答语为省略句,补全为:We haven’t known each other very long. We have known each other since we started to work in the company.  
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