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问题: 求助一道英语选择题3

It is said in Australia there is more land
than the government knows___.
A.it what to do with B.what to do with it
C.to do what with it
答案选B,但这句子是什么意思,选B是什么用法

解答:

据说澳大利亚总的土地远远多于政府知道怎么用的。B是固定用法由特殊疑问词加上动词不定式