This is _____song .I've told you about it.Isn't it ___ beautiful one?

问题描述:

This is _____song .I've told you about it.Isn't it ___ beautiful one?
为什么填the;a

第一个空填 the ,表示特指.“这就是那首歌.”
第二个空填a ,表示泛指 .“我告诉过你,难道不是一首很美的歌吗?”