问题补充：
Every time they met , they would talk several hours together about the persons and things they remembered in the middle school.
A. that; who and which
B. when ; which
C. /; that
D. which ; /
答案：
A. that; who and which
B. when ; which
(答案→)C. /; that
D. which ; /
解析：考查定语从句。句中every time每次，作动词，故不需要关系词；that引导定语从句，先行词为persons and things，指人和物，关系词只能用that，选C。
