They talked about the persons and things they remembered at school.A. whichB. who C. that

问题补充：

They talked about the persons and things they remembered at school.

A. which

B. who

C. that

D. whom

答案：

A. which

B. who

(答案→)C. that

D. whom

解析：考查定语从句，先行词是the persons and things，定语从句缺少宾语，用关系代词，因为先行词有人有物，定语从句用that引导，句意：他们谈论在学校能记住的人和事。选C。