He still remembers the days he spent with your family.A. whenB. whereC. thatD. on which

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A. when
B. where
(答案→)C. that
D. on which
解析：考查定语从句，本题的先行词是the days，定语从句中that指代先行词在句作为动词spend的宾语。句意：他仍然几个在你们家住过的日子。故C正确。