They are doing their homework now.用at this time yesterday 改写
题目
They are doing their homework now.用at this time yesterday 改写
答案
They were doing their homework at this time yesterday.
改为过去进行时
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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