They talked for about an hour of things and persons they remembered in the school. A. whi

问题补充：

They talked for about an hour of things and persons they remembered in the school.

A. which

B. that

C. who

D. whom

答案：

A. which

(答案→)B. that

C. who

D. whom

解析：句意：他们回忆起了在学校时的人和事，谈了一个小时。此空后面是定语从句，先行词是things and persons，当先行词即有人又有物时，定语从句由that引导。故答案选B。