— I was worried about math but Mr. Brown gave me an A!— That’s a difficult course.A. Hav

问题补充：

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

— That’s a difficult course.

A. Have a good luck.

B. Not really.

C. Congratulations!

D. You do?

答案：

A. Have a good luck.

B. Not really.

(答案→)C. Congratulations!

D. You do?

解析：这题考查交际用语：Have a good luck祝好运， Not really.不是真的， Congratulations!祝贺，You do?真的吗？句意是：--我担心数学，但是布朗先生给我一个A。--祝贺你，这是很难的课程。选C。