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

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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。