F: I remember that you taught in a school when you were in Beijing. ,M: Yes, that's right. I was a teacher at No.15 Middle School. ,F: What do you do now? ,M: I do the same thing in Shanghai now.
(A) F: So you are still a teacher in Shanghai, but you were in Beijing. (B) F: You mean you are a student in a middle school. I remember that you studied in a school when you were in Beijing. (C) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) F: Being a teacher in Shanghai is a good choice. So you were teaching at No.50 Middle School.
A