____ racial problems have not been solved and full equality has not been att____ racialproblems have not been solved and full equality has not been attained yet,progress in these directions has been quite remarkable.A. Since

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____ racial problems have not been solved and full equality has not been att
____ racial
problems have not been solved and full equality has not been attained yet,
progress in these directions has been quite remarkable.
A. Since B. Although C. Now that D. Before

选b吧,大意是:尽管种族问题仍未解决,也没有实现完全意义上的平等,但是这些方面取得的进展还是显著的.这里需要的是意义的转折,although表示转折.