Someone saw him swim in this Lake yesterday.改成被动语态
题目
Someone saw him swim in this Lake yesterday.改成被动语态
答案
He was seen to swim by them in this Lake yesterday
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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