问题
单项选择题
—Do you mind if I smoke —（）.
A. Why not
B. Yes, help yourself.
C. Go ahead.
D. Yes, but you'd better not.
答案
参考答案：C
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。故选C。