i will never forget the day __we spent together last week A that B which C / D A,B and C

题目

i will never forget the day __we spent together last week A that B which C / D A,B and C
说说答案和理由

答案

D
先行词为事物,所以用that或which都行；其次,先行词在从句中作宾语,所以也可以省略,所以不填也可以.