F: Eric, how long will you be in China? ,M: I don't know, well my contract here is for one year and I don't know what I should do after that, maybe going around for a while. ,F: Well. Have you ever thought about learning some Chinese? ,M: Actually I am learning that now, but it's too hard for me. The four tones really drive me mad.
(A) F: You are not interested in Chinese at all? But you should start learning. (B) F: Though you find the four tones challenging, you have mastered Chinese. (C) F: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (D) F: I totally understand. The four tones are puzzling to many, not only you.
D