I shall never forget the days I spent in Beijing University, has a great effect on my li

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(答案→)A. that; which
B. which; that
C. when; that
D. when; which
解析：考查定语从句。That/which I spent in Beijing University修饰先行词the days, That/which在句中做spend的宾语。第二空which引导非限制性定语从句，指代前面一句话，在句中做主语。句意：我永远都不会忘记在北大度过的日子。它对我的一生有很大的影响。