根据所给时间状语改写下列句子
题目
根据所给时间状语改写下列句子
There aren't any old houses in this city.
_____________________________five years ago.
My father id busy every day.
_______________________________last night.
答案
There weren't any old houses in this city five years ago.
My father was busy last night.
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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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