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;/

答案及解析： C

解析：

本题考查定语从句。第一空中由于every time用在句中作连词，所以这里不需要关系词；

第二空考查定语从句，先行词是persons and things，即指和物，在从句中作动词remember的宾语，故关系词只能用that。句意：每次他们见面的时候，他们都将花几个小时在一起谈论在中学时他们记得的人和事。