What a clean room ! 是正确的.
这里主要涉及感叹句的知识: 对名词感叹用what, 对形容词或副词感叹用how.
其结构如下:
What (a/an)+adj. +n. + 主语+谓动!
How +adj./adv. + 主语+谓动!
如: What a beautiful girl she is !
What fine weather it was yesterday !
What happy children they are !
How beautiful the girl is !
How fine the weather was yesterday !
How happy they are !
How clean the room is !
What a clean room.room做房间用是可数的的。
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