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;/
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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。