------ ---- useful piece of advice the teacher gave us.为什么用what 请说明理由

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----------usefulpieceofadvicetheteachergaveus.为什么用what请说明理由----------usefulpieceofadvicetheteacherga

------ ---- useful piece of advice the teacher gave us.为什么用what 请说明理由
------ ---- useful piece of advice the teacher gave us.为什么用what
请说明理由

------ ---- useful piece of advice the teacher gave us.为什么用what 请说明理由
应该是What an吧?
这句话是感叹句
How +adj.&adv.
What +n
What an useful piece of advice
修饰的是名词advice所以用What
而useful开头发音是元音所以用 an

这是固定句型, 没有原因