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
网友回答
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。