-- Everyone says you are a good student. You never fall asleep in class, do you?-.A. No

-- Everyone says you are a good student. You never fall asleep in class, do you?
--- .
A. No, I didn’t
B. Yes, I did
C. Yes, never
D. Yes, sometimes

A. No, I didn’tB. Yes, I didC. Yes, never(答案→)D. Yes, sometimes解析：考查前肯后否的反意问句的回答：这种问句要根据实际情况回答，还有前后要一致，C项就不对，AB的时态不对，句意是：每个人都说你是好学生，你上课从不睡觉，是吗？选D，不，有时睡。

就是这个解释