140 peter received a letter just now __his grandma would come to see him soon
题目
140 peter received a letter just now __his grandma would come to see him soon
said saying
why?
答案
用saying,其实你可以这样理解,是letter上面写着,不是letter被说.所以用主动形式
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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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