Idont know the girl has long hair ,为什么不对

正确答案为：
I don't know the girl with long hair.我不认识那个长发女孩.
一个句子不能有两个谓语动词,把 has 改为 with
再问： know后跟宾语从句不可以吗
再答： 可以跟从句，只能跟定语从句来修饰girl
I don't know the girl who has long hair.

who has long hair 就是定语从句，修饰 the girl