—Do you mind if I smoke? — A. Why not?B. Yes, help yourselfC. Go aheadD. Yes, but you’d b

—Do you mind if I smoke?
—
A. Why not?
B. Yes, help yourself
C. Go ahead
D. Yes, but you’d better not

A. Why not?B. Yes, help yourself(答案→)C. Go aheadD. Yes, but you’d better not
解析：
本题考查交际用语，表示许可时，肯定回答常用“Yes, please./ Of course, you may./ Go ahead, please./ Not at all./ Just help yourself.”等表示。B和D选项前后矛盾。

感谢回答，我学习了