It’s going to be some time he sees his father again business has just been started in S

问题补充：

It’s going to be some time he sees his father again, business has just been started in Switzerland．

A. after; who

B. before; whose

C. when; whose

D. since; who

答案：

A. after; who

(答案→)B. before; whose

C. when; whose

D. since; who

解析：考查before的用法及定语从句。句意：再过一段时间他才能再次看见他的父亲。他父亲的商业刚在Switzerland开办。Before在这里是才的意思， whose在这做定语。故选B。