把状语改为不定式短语：the mother was pleased when she saw her son doing so well at school
题目
把状语改为不定式短语：the mother was pleased when she saw her son doing so well at school
答案
the mother was pleased to see her son doing so well at school
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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