--It’s really nice of you to help me!--A. My pleasure. B. Don’t say that C. Is that so?

问题补充：

--It’s really nice of you to help me!

--

A. My pleasure. B. Don’t say that C. Is that so?

答案：

解析：本题的含义是你真好能够帮助我，我们通常表示很乐意来回答，A项表示此意，故本题选A。