—May I ask a question after class，Sir?
— , but not during my lunch break.
A. I am sorry
B. Anytime
C. Go ahead
D. Certainly
网友回答
A. I am sorry
B. Anytime
C. Go ahead
(答案→)D. Certainly
解析：考查情景交际。句意：--老师，下课后能问你一个问题吗？--当然，但是不是在午餐时间。A对不起；B无论何时；C去吧，用吧；当然D。故选D。