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