The moment I will never forget is my parents discussed my new school life with me before

问题补充：

The moment I will never forget is my parents discussed my new school life with me before the new term started.

A. that

B. which

C. when

D. where

答案：

A. that

B. which

(答案→)C. when

D. where

解析：考查名词性从句中的表语从句，句意：我永远不会忘记的时刻就是在新学期开始之前我的父母讨论我的新学校生活的时刻。所以选C。