It will be long she sees Mr. White again at Beijing, business has just started in Switzerland.
A. after; who
B. since; who
C. when; whose
D. before; whose
网友回答
A. after; who
B. since; who
C. when; whose
(答案→)D. before; whose
解析：选D。考查复合句。从题干的所用句型和时态可知前部分是句型It will be long before加从句; 逗号之后是一个非限制性定语从句, whose business在定语从句中作主语, 所以选D项。