It was the truth that the black reached a stage they had almost no rights at all in the p

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A. when
B. where
C. which
D. that
解析：名词point, condition, situation, stage, case, position等作先行词在定语从句中做状语，表示“场所、状况”等含义，从句应该用where引导。本题意为：黑人处于无权状态。故选择B项。