Speaker A: Thank you very much for inviting us to such a delightful dinner. Speaker B: ____
【正确答案】 B
【答案解析】解析：首先判断出本对话的语言功能为感谢对方。应对感谢的表达法为"别客气!"(You are quiet welcome)．其他选项的表达法不能满足本语言功能的要求。