______racial problems have not been solved and full equality has not been attain

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问题 ______racial problems have not been solved and full equality has not been attained yet, progress in these directions has been quite remarkable.

选项 A、Since
B、Although
C、Now that
D、Before

答案 B

解析状语从句。although意为“尽管，虽然”，引导让步状语从句；since意为“因为；既然”；now that意为“现在已经……；既然已……”；before long意为“不久”，不是连词，不能带从句。

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