问题补充：
---. Can I help you ? --- .
A. How much are they?
B. Yes, please. Do you sell bags?
C. How about this one?
D. Here you are.
答案：
A. How much are they?
(答案→)B. Yes, please. Do you sell bags?
C. How about this one?
D. Here you are.
解析：A他们多少钱？B好的，你们卖包吗？C这个怎么样？D给你。结合句意可知是在商店的对话：我能为你服务吗？好的，你们卖包吗？故选B。
