It is said in Australia there is more land than the governme

It is said in Australia there is more land than the government knows ( ).
A.it what to do with B.what to do with C.what to do with it D.to do what with it
感觉上只能选C,但不知怎么翻译好.还有,为什么it不能去掉?

比较难理解的是因为它深略掉一部分,把它补齐了就好翻译了.
It is said in Australia there is more land that the government doesn't know to do with than the land which the government knows what to do with.
据说,在澳大利亚,更多的土地是政府不知道如何开发利用的.（去过澳大利亚的人都应该有这样的体会,开车出了城市以后是什么样的感觉了.）
it在句子省略后的than引导的从句中扮演宾语成分,所以不能去掉.