A.Sorry, he is busy at the moment.B.No, you can't. C.Sorry, you can't.D.I don't know.
A.My name is Zhao Hua B.I'm Zhao Hua C.This is Zhao Hua speaking D.Zhao Hua is me
A.Yes, I am Clinton. B.Thank you for calling me. C.This is Clinton speaking. D.Yes, who are you?