There is more land in Australia than the government knows __________.怎么填?为什么?

There is more land in Australia than the government knows __________.怎么填?为什么?

what to do with it
There is more land than （land which) the government knows what to do with it.
澳大利亚的土地多得政府都不知道作何用途

to do with it 。与政府知道该怎么处理的土地面积相比，澳大利亚有更多的土地是他们不知道该怎么办的。 望采纳！