—Sorry,I can't go camping with you. I have to prepare well enough for the entrance-exam.
— !We can camp together next time.
A. Don't say so
B. Congratulations
C. Good luck
D. No problem
网友回答
A. Don't say so
B. Congratulations
(答案→)C. Good luck
D. No problem
解析：good luck 用来表示祝愿幸运。