单选题
It can be inferred that blues really became a musical pattern of its own right______
A、
in the 1920s and 1930s when it evolved into classic "city" blues
B、
in 1912 when it entered the range of popular song
C、
in 1940s when some modem musical instruments were used
D、
in the 19th century when black American songs were widespread
【正确答案】
A
【答案解析】
第二段第四、五句指出，在1912年随着“孟斐斯布鲁斯”由Handy出版，布鲁斯进人流行歌曲的行列。古典城市布鲁斯于20和30年代发展起来。
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