We have reached a point a change is needed. A. whenB. with whichC. whyD. where

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A. when
B. with which
C. why
D. where
解析：考查定语从句，先行词是a point一个地步，定语从句缺少地点状语，用where引导定语从句，句意：我们到了需要改变的地步了。选D。