the two things ( ) Marx was not sure were the grammar and some of the idioms of english
题目
the two things ( ) Marx was not sure were the grammar and some of the idioms of english
答案
about which
The two things about which Marx was not sure were the grammar and some of the idioms.马克思不大有把握的两个方面是语法和某些习惯用语.
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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