—I was worried about my math but MrBrown gave me an A. —.A．Don’t worry about it．B．Congrat

问题补充：

—I was worried about my math，but Mr．Brown gave me an A. —.

A．Don’t worry about it．

B．Congratulations! That’s a difficult course．

C．Mr．Brown is very good．

D．Good luck to you!

答案：

解析：考查交际用语。A.别担心；B.祝贺你！那是一门很难的课程； C.布朗先生非常好；D. 祝你好运！句意：——我担心我的数学，但布朗先生给了我一个A。——祝贺你！那是一门很难的课程。故B正确。