She brought with her three friends,none of whom I had ever met before.
题目
She brought with her three friends,none of whom I had ever met before.
为什么不能用none of them?
答案
因为后面也是一个完整的句子,如果没有连词会造成语法错误
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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