I shall never forget the days I stayed in Africa has brought me a lot of advantages.A.

问题补充：

I shall never forget the days I stayed in Africa, has brought me a lot of advantages.

A. that; which

B. when; which

C. when; that

D. which; that

答案：

A. that; which

(答案→)B. when; which

C. when; that

D. which; that

解析：考查定语从句的关系词。先行词days在定从 I stayed in Africa中作时间状语，所以用when引导，排除A,D；定从 has brought me a lot of advantages的先行词是前面整个句子，且是非限制性定从，要用which引导。所以选B。