—Sorry I cant go camping with you. I have to prepare well enough for the entrance-exam.　　

问题补充：

—Sorry,I can go camping with you. I have to prepare well enough for the entrance-exam.

—!We can camp together next time.

A. Don say so

B. Congratulations

C. Good luck

D. No problem

答案：

A. Don say so

B. Congratulations

(答案→)C. Good luck

D. No problem

解析：good luck 用来表示祝愿幸运。