—Listen! Someone is playing piano.—Wow! beautiful music! I like it very muchA. a; what B.

问题补充：

—Listen! Someone is playing piano.

—Wow! beautiful music! I like it very much

A. a; what

B. an; How

C. the; What

D. /; How

答案：

A. a; what

B. an; How

(答案→)C. the; What

D. /; How

解析：弹奏乐器时，乐器前面必须加定冠词the，用排除法可知选C。