This is song I’ve told you about. Isn’t it beautiful one?A. the; theB. a; aC. the; aD. a

问题补充：

This is song I’ve told you about. Isn’t it beautiful one?

A. the; the

B. a; a

C. the; a

D. a; the

答案：

A. the; the

B. a; a

(答案→)C. the; a

D. a; the

解析：第一空song后面有从句做定语修饰，所以要定指，“这是我给你提过的那首歌。”（定指，用the）；第二空否定疑问句不用定指,“是一首优美的歌曲吧？”（不定指，用a）