------beautiful music they are enjoyingA what B how C what a D how a

问题描述:

------beautiful music they are enjoyingA what B how C what a D how a

A.
What + 名词+ 主语+ 谓语.
How + 形容词(或副词)+ 主语+ 谓语.
这是感叹句的两种类型.
这里的beautiful music是名词,所以用what.但它是不可数名词,所以不加a.
故选A