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
B. when; which
C. /; that
D. which; /
答案：
A. that; who
B. when; which
(答案→)C. /; that
D. which; /
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。
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