I will never forget the days whiich I spent in the countrysi

which关系代词,定语从句中 缺乏主语、宾语时使用这里 I spent the days spent缺了宾语 “度过那些日子”where 关系副词,在成分基本完整时,选用如:I will never forget the days which i lived in the countryside 。