问题补充:
-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:
A. after
B. before
C. when
(答案→)D. since
解析:句意:--你们认识很长时间了吗?--不很长,自从我们在一个公司上班。After在……之后; before在……之前; when当……时候; since自从。因为答语是省略句,
完整的是:We haven known each other since we started to work in the company.只有since表示从过去到现在一直认识,并且它与现在完成时连用,故选D。