单项选择题
根据各组对话内容，从下面方框里提供的5个选项中选出最佳选项
A：I’m leaving for HongKong for aweekend break. B：（）。
A．Sure. What is it B．It’s very nice of you to say so. C．It’s nothing. D．Have a nice trip! E．Certainly. Here you are.