he try to catch him before/after he got away
题目
he try to catch him before/after he got away
答案
正确的句子是：He tried to catch him before he got away.
如果用after ,意思不通顺,“跑开之后”怎么还能“抓住呢”?
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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