There are moments I forget all the things happened in the past.
A. what; which
B. that; that
C. when; that
D. which; what
网友回答
A. what; which
B. that; that
(答案→)C. when; that
D. which; what
解析：考查定语从句：第一空用when引导定语从句，修饰moments，因为定语从句I forget all the things缺少的时间状语，第二空填that，修饰all the things，从句中缺少主语。句意是：我一段时间我忘了过去发生的所有的事。选C。