定语从句中：
on which=when
in which=where
for which=why
that引导的整句从句作定语修饰名词the day,先行词the day作从句中的状语.这句that的用法是不对的（on which的用法是对的,同样可以用when）.要用that的话不能这么用,但可以改成：We arrived the day that they spent going out.(这时候the day就作你所提到的宾语（注意这里是指充当从句中的宾语）.