The days are gone physical strength was all you needed to make a living.A. whenB. thatC. w

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(答案→)A. when
B. that
C. where
D. which
解析：这是when引导的分割式的定语从句，先行词是The days，英语中为了句子的平衡，而采用了这种方式。that which不能在定语从句中作状语，where的先行词应是地点，故选A。