F: Today we are going to discuss how to write better. ,M: Excuse me. ,F: Ah, Tom, you're late again. ,M: I'm sorry, Mrs Green. ,F: What's the excuse this time? ,M: I must have turned off my alarm clock and gone back to sleep again.
(A) F: So I am having a class when you come. (B) F: I’m sorry, I don’t understand. Could you say it again? (C) F: Although I am having a meeting when you come this time, this is your first time to be late. I forgive you. (D) F: I am correcting homework when you come. You've never been late.
A