单项选择题Jim: Oh, are you going out Tony: Yes, I'm going for a walk. ______________________ Jim: Yes, as a matter of fact, I need some stamps. Tony: Okay, then. I'll drop in at the post office for you on my way back.
A.Aren't you going shopping
B.Shall I come back in about an hour
C.Do you want to come with me
D.Can I pick up anything for you