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：限制行定语从句中，只用that的情况——当先行词既有人又有物，由题可知，先行词为things and persons ，在定语从句中作动词remembered的宾语，本题大意，在大约一个小时的时间里，他们都在谈论学校里记得的那些人和那些事。故B正确。