－Have you been acquainted with each other for long?

－Not very long, ____________ we started to work in the company.

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

四川省内江六中2011届高三第五次月考

－Have you been acquainted with each other for long?

－Not very long, ____________ we started to work in the company.

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