单项选择题
A.wrote seven million songs B.sold seven million copies of his songs C.wrote seven songs D.sold seven million copies Of his seven songs
A.Hank Williams, A Great Singer and Songwriter. B.The Influence of Blues and Black Music. C.A Brief Introduction to Country Music. D.Country Music Combined With Electric Instruments.
A.1920s B.1930s C.1940s D.1950s