请问he found his house in a mess and he didn't know what to do with it.

问题描述:

请问he found his house in a mess and he didn't know what to do with it.
请问为何该句最后还要加it?what不已经是do的宾语了吗?为何还要再加it这个宾语呢?

这里 it 是with 的宾语what不难道不是with的宾语吗??what是do的宾语阿