of 后面what we called modern art 是做介词 of 的宾语 ，介词宾语 ，what引导的宾语从句

例如

Tom has a toy that his father bought for him last weekend.

汤姆有一个玩具，那是上个周末他爸爸买给他的

扩展资料

of

prep.属于(某人);关于(某人);属于(某物);(某事)部分的;关于(某物);出身于(某背景);住在(某地);

This is one of the most commonly used methods.

这是最常采用的方法之一。

The two groups of children have quite different characteristics.

这两组儿童具有截然不同的特点。

The project is still causing him a lot of problems.

这项工程现在仍然给他带来许多的麻烦。

The need to communicate is a key characteristic of human society.

需要交流是人类社会最重要的一个特征。