因为你中间用了how,它是作状语成份的.
如果没有了it,那就是从句缺宾语了,那只能用what了.
是宾语从句.
疑问词加不定式I dont't know how to do it.一定要加it吗?为什么?这句话是宾语从句吗?
3个回答
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