I have been teaching for over twenty years but never a girl as bright as Lily.A. I have

问题补充：

I have been teaching for over twenty years, but never a girl as bright as Lily.

A. I have met

B. I had met

C. have I met

D. had I met

答案：

A. I have met

B. I had met

(答案→)C. have I met

D. had I met

解析：never从不，否定含义，放在句首，句中的主谓要用倒装结构。根据句意用现在完成时。句意：我教学超过20多年，但我从没有遇到过和Lily一样聪明的女孩。