He talked a lot about things and persons they remembered in the school.
A. that
B. which
C. whom
D. what
网友回答
(答案→)A. that
B. which
C. whom
D. what
解析：考查定语从句。本定语从句的先行词是things and persons既有人，又有物，故使用that.句意：他谈论了他们记住的在学校里的人和事情。Which只能指事物；whom只能指人。What不是定语从句的关系词。故A正确。