—At last I’ve made it.I am on top of the world.—A. Congratulations!B. You are really cleve

问题补充：

—At last I’ve made it.I am on top of the world.

—

A. Congratulations!

B. You are really clever!

C. Oh,really?

D. Congratulate!

答案：

(答案→)A. Congratulations!

B. You are really clever!

C. Oh,really?

D. Congratulate!

解析：向某人的成功表示祝贺要用复数“congratulations”.