I often think of the hours I stayed with you, has had a great effect on my life.A. that;

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A. that; which
B. which; who
C. which; that
(答案→)D. when; which
解析：考查定语从句。本题第一空定语从句的先行词是the hours，后面的定语从句中的句子结构很完整，故使用关系副词when；第二空是一个非限制性定语从句，which指代前面一句话的内容，在后面句中做主语。句意：我经常会想起和你一起待过的时间，这对我的生活有很大的影响。故D正确。