M: Excuse me, is this seat taken? ,F: I don't think so. The man finished his lunch and left a few minutes ago.
(A) M: Thank you. By the way, this is a nice library, right? (B) M: I’m sorry, I didn’t catch that. Would you mind speaking more slowly? (C) M: Thank you. The environment of this restaurant is pretty good.By the way, do you know the woman who has just finished her lunch at this seat? (D) M: Thank you. Let's get off the bus now.
B