I’ll never forget the days I spent on the farm.A. whenB. thatC. in whichD. in that

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A. when
(答案→)B. that
C. in which
D. in that
解析：考查定语从句，先行词是the day，定语从句中缺少宾语，用that或which或省略关系代词，句意：我永远忘不了在农场度过的日子。选B。