英语改错,求详解

问题描述:

英语改错,求详解
One of my unforgettable memories of my school in * is that of lunches we brought from our homes.
答案是给lunches前面加the
为什么要加?为什么不能去掉lunches 前的of?

of the lunches we brought from our homes.
是介词短语作that的定语,we brought from our homes是lunches的定语从句,从句中的关系代词that被省略,定语从句的先行词是特指名词.
One是句子的主语,of my unforgettable memories of my school in * 是One的定语,
is 是谓语,that是表语,of lunches we brought from our homes 是介词短语作that的定语,这儿没有表语从句.that指前面的One,即one
unforgettable memory.Do you understand?