问题补充：
---I’m going to take part in the piano competition next week. ---
A. Congratulations！
B. Good luck！
C. Not at all！
D. With pleasure.
答案：
A. Congratulations！
(答案→)B. Good luck！
C. Not at all！
D. With pleasure.
解析：Congratulations！恭喜啊；Good luck！祝你好运；Not at all！一点也不；With pleasure.万分荣幸。根据上文，下周我要去参加钢琴比赛。可知选B最符合语境。
