M: How long does it take you to drive home when there is not much traffic? ,F: Only 25 minutes, but if I can't leave my office before 5:30 PM, it sometimes takes me 50 minutes.
(A) M: Excuse me, could you repeat the question? (B) M: Really? When it isn't the rush hour, it will take you twenty minutes to walk home? (C) M: OK, I see. If you can leave your office before 5:30 PM, it sometimes takes you 50 minutes. When it isn't the rush hour, it will take you twenty-five minutes to drive home. (D) M: Okay. You mean if you can't leave your office before 5:30 PM, it sometimes takes you 30 minutes. When it isn't the rush hour, it will take you fifty minutes to walk home.
A