一个英语句子的主语是什么?

问题描述:

一个英语句子的主语是什么?
My ambition,love for philosophy,interest in politics,and thirsts for the perfect poem or story were fed and shared by students from all over the world there
还有为什么要用这种形式的主语呢?

My ambition,love for philosophy,interest in politics,and thirsts for the perfect poem or story 均为句子主语,这是多个并列名词作主语的情况(有动词were也可以知道句子的主语不止一个,故楼上的说法明显错误)