I still remember the day_____she first wore that

I still remember the day_____she first wore that pink dress.
A.which B.in which C.on that D.on which
选哪个 为什么 告诉我下什么时候需要在关系代词前加介词 什么时候又不用

答案D
on which具体指on that day。

when或on which 这是一个定语从句，先行词是the day，先行词放到从句中你看一下充当什么成分： she first wore that pink dress (on that day) 是作时间状语，在那天她第一次穿那件粉色连衣裙 the day 用which指代是没错，但on这个介词不可省略的啊 因此作时间状语要用when，或者on which

D，定语从句修饰的是day，从句中是on the day，所以是on which，望采纳