He still remembers the days ＿ he spent with your family.横线里是填that 还是when?

题目

He still remembers the days ＿ he spent with your family.横线里是填that 还是when?

答案

that
定语从句spent 是及物动词,缺宾语,即：
spent the days with your family
when 不能作宾语
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