1.I will never forget the day____ I spent with you. 原句:I will never forget the day。The day I spent with you. 2.I will never forget the day __when___ I lived in beijing. 因为:I lived in 北京 (at) the day
I spent the day with you直接带宾语的I will never forget the day __that__ I spent with you. 因为:spend the day是宾语