This is___song I’ve told you about .Isn't it_______beautiful one?

This is___song I’ve told you about .Isn't it_______beautiful one?
This is___song I’ve told you about .Isn't
it_______beautiful one?

This is___song I’ve told you about .Isn't it_______beautiful one?
the 后面有定语修饰,所以要特指
a 否定疑问句不用特指

the
a

the
a
第一空是特指，第二个是泛指