Rock music was A(original) B(a mixture) of country music and C(rhythm) D(and) blues.

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Rock music was A(original) B(a mixture) of country music and C(rhythm) D(and) blues.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗