why have you done it this way?the goal is to keep useful shings from being thrown away
题目
why have you done it this way?the goal is to keep useful shings from being thrown away
为什么在from 后面用being thrown away
答案
keep from doing sth 固定搭配
be thrown away 被动用法
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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