A、  B、  C、  B题目是否定疑问句，询问想不想去市政厅，因此回答必须是肯定的或否定的。(A)用yes表示肯定，但是后半部分与题目不符； (C)说的是地点，与问句不符。(B)回答说虽然想去，但是时间可能不够，是正确答案。

Could you recommend any good place to eat around here?
(A) There’s one across the street.
(B) You need at least one recommendation.
(C) Yes, I already ordered my lunch.

Don’t you want to visit the city hall while you’re in town?
(A) Yes, I’ll visit the museum next week.
(B) I do, but I don’t think I have enough time to do it.
(C) No, it’s located at the intersection.