问题补充：
----I’m going to Tibet for vacation.
----.
A. You’re welcome
B. I’d love to
C. Have a good time
D. I’m sorry to hear that.
答案：
A. You’re welcome
B. I’d love to
(答案→)C. Have a good time
D. I’m sorry to hear that.
解析：You’re welcome欢迎你，不客气；I’d love to我乐意；Have a good time祝你玩得愉快；I’m sorry to hear that.很抱歉听到这个消息。根据上文，我要去西藏度假了。可知选C。
