问题
选择题
— Have you known each other for long?
— Not very long, ____ we started to work in the company.
A．after
B．before
C．when
D． since
答案
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.