—Listen! Our music teacher is playing the music of Two Butterflies.—!A. What a sweet music

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A. What a sweet music
B. How sweet music
C. How a sweet music
(答案→)D. What sweet music
解析：以what引导的感叹句的基本句型结构为what a/an +adj+可数名词单数+主语+谓语！；what+adj+可数名词的复数/不可数名词+主语+谓语！以how引导的感叹句的基本句型结构为how+adj/adv+主语+谓语！