It is human,perhaps,to appreciate little that which we have and to long for that which we have not.这句话中第一可以确定to do是真的的主语,但that和which we have 不是非常重复吗,直接用which we have从句作为appreciate的宾语不能吗
这里的 that 是 appreciate 的宾语,同时是后面的定语从句修饰的先行词,不可以省略;which 是关系代词,在定语从句中作have的宾语,可以省略。为appreciate的宾语不能吗