问题补充：
—I’m going to West Lake on vacation. —
A. Don’t wait.
B. I’m sorry to hear that.
C. Have a good trip!
D. Bad luck!
答案：
A. Don’t wait.
B. I’m sorry to hear that.
(答案→)C. Have a good trip!
D. Bad luck!
解析：A. 不要等了；B.很遗憾听到这个消息；C.祝你旅途愉快；D.真倒霉。根据上文，我要去西湖度假。可知选C最符合语境。
