they built the old house over one hundred years ago改为被动语态
题目
they built the old house over one hundred years ago改为被动语态
答案
the old house was built by them over hundred years ago
they 是主体,house客体,变被动 客体变主体,主体变客体,一般过去式 用 was,were + done ,house 单数,用was
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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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