Never in my life I forget the days we used to play together when we were children.A. where

问题补充：

Never in my life I forget the days we used to play together when we were children.

A. where

B. that

C. which

D. when

答案：

A. where

B. that

C. which

(答案→)D. when

解析：when引起定语从句，前面的先行词是表时间的词。