The blues has been part of African-American culture since then, and it is still important

The blues has been part of African-American culture since then, and it is still important part of American culture.
A. a; a
B. / ; an
C. the ; a
D. / ; a

A. a; a(答案→)B. / ; anC. the ; aD. / ; a解析：第一个part表示“密不可分的一部分”所以前不加冠词，第二个part表示“作用”前应有冠词又因 important元音开头，所以答案B。

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