beautiful music it is!A. WhatB. HowC. What aD. How

问题补充：

--- beautiful music it is!

A. What

B. How

C. What a

D. How

答案：

(答案→)A. What

B. How

C. What a

D. How

解析：句意：它是多么美妙的音乐。感叹句一般有两种结构：what +(a/an)+形容词+名词+主语+谓语！名词是复数或不可数名词，不加a/an.how+形容词+主语+谓语！music不可数名词。故选A。