A.Interrupt him whenever he detected a mistake. B.Focus on the accuracy of the language he used. C.Stop him when he had difficulty understanding. D.Write down any points where he could improve.
【单选题】听力原文:W: Bob, are you going straight home after school today? M: No, I have a class until one o'clock and after that I'm going to spend a couple of hours at the library before going home. When is Bob g...