— Why did you talk to the teacher after class?

— I don't understand ________ during the lecture.[      ]

 A. the problem did she tell us

B. how did she say

C. that she was talking about

D. what she was teaching

在意外伤害保险中，如果被保险人在保险期限内遭受意外伤害，责任期限届满时治疗仍在继续，则保险人确定被保险人残废程度的时点是( )。

A．保险期限结束时

B．意外伤害发生时

C．责任期限开始时

D．责任期限结束时