问题补充：
---You won the first prize in the Physics competition.
---. I made several terrible mistakes.
A. I think so
B. You must be joking
C. You are welcome
D. It doesn’t matter
答案：
A. I think so
(答案→)B. You must be joking
C. You are welcome
D. It doesn’t matter
解析：I think so 我想是这样；You must be joking你在开玩笑吧；You are welcome欢迎你，不客气； It doesn’t matter没关系。句意：你在物理比赛中获得了一等奖。根据下文，我烦了几个严重的错误。可知选B最符合语境。
【考点】情景交际
