—Let’s go and have a good drink tonight一 Have you got the first prize in the competition？

问题补充：

—Let’s go and have a good drink tonight

一 Have you got the first prize in the competition？

A. What for?

B. Thanks a lot．

C. Yes I’d like to

D. Why not？

答案：

(答案→)A. What for?

B. Thanks a lot．

C. Yes I’d like to

D. Why not？

解析：根据语境判断，此处是疑问语气，不理解对方为什么要请自己，因此问“为什么?”