听句子,选出该句的最佳答语。 ( )1.A.Bad luck. ( )2.A.Yes, you must. ( )3.A.That's right. ( )4.A.See you tomorrow. ( )5.A.Ok. I will. B.I agree with you. B.No, thanks. B.Yes, I'd like to. B.Help yourself. B.I know it well. C.Must you go soon? C.Of course not. C.It doesn't matter. C.Have a good trip. C.I see.