My father and his teacher talked a lot about the things and persons they could remember.A

问题补充：

My father and his teacher talked a lot about the things and persons they could remember.

A. who

B. which

C. what

D. that

答案：

A. who

B. which

C. what

(答案→)D. that

解析：考查定语从句。当先行词既有人又有物的时候，关系代词使用that，代替he things and persons作为remember的宾语。故D正确。