问题

Hi, John. Are you still a smoker—-.It’s two years since I stopped smoking.
A:The author's grandfatherwas born blind
B:Yes, I do
C:No, but Iused to
D:Oh, yes, but Iwish I didn’t
B:Yes, I do
C:No, but Iused to
D:Oh, yes, but Iwish I didn’t
正确答案是: