I shall never forget those years I lived on the farm you visited last week.A. when; wher

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A. when; where
B. which; which
(答案→)C. when; which
D. which; where
解析：考查定语从句。When I lived on the farm修饰先行词those years.定语从句中主语是I谓语动词live,它是不及物动词，不需要直接加宾语，on the farm是地点状语，句子是完整的，所以使用关系副词when;
Which you visited last week修饰先行词farm。句中主语是you,谓语动词visit,它是及物动词，后面需要宾语，所以用关系代词which指代先行词farm在句中做宾语。