It is said that in Australia there is more land than thegoverment knows what to do with it?

题目

It is said that in Australia there is more land than thegoverment knows what to do with it?
knows what to do with it中with it 为何非加不可?

答案

固定短语
what to do with sth.
怎么处置某物
或者还有一种说法
how to deal with sth.
一个意思的
with it 是what的宾语