This is the placewe visited last year.A. whenB. whereC. whichD. who

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A. when
B. where
(答案→)C. which
D. who
解析：考察定语从句。先行词是the place,定语从句中的主语是we,谓语动词是及物动词visit，后面缺宾语，故使用关系代词which指代指物的先行词the place子句中作宾语。故C正确。