【单选题】
Which of the following is true______
A．Ragtime originated with the big bands in the 1930s
B．Ragtime and blues were based on African music
C．Ragtime and blues had not evolved until 1950s
D．Blues was performed by singers dressed in blue
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根据网考网移动考试中心的统计，该试题：
4%的考友选择了A选项
50%的考友选择了B选项
31%的考友选择了C选项
15%的考友选择了D选项
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