I think you know that is the hardest part of vocabulary.(我想你知道最难的部分是词汇量)
题目
I think you know that is the hardest part of vocabulary.(我想你知道最难的部分是词汇量)
语法是否错误?怎么表达最佳?
答案
I think (that)you have already known that it is the hardest part of vocabulary.
两个宾语从句
I think you know (that)(这里少个主语it ) is the hardest part of vocabulary.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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