I will never forget the day I came to my university and the day I spent in a new city. A

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(答案→)A. when; which
B. which; when
C. what; that
D. on which; when
解析：在本句中两个先行词the day都是表示时间的名词,但第一个空白处要填的关系词在从句中作状语,因此要用关系副词when. 第二个空白处要填的关系词在从句中作动词spent的宾语,因此要用关系代词which或that来引导定语从句.