He went home after his teacher came in.(改为同义句）
题目
He went home after his teacher came in.(改为同义句）
He ________ go to bed ________ his teacher came in.
答案
He went home after his teacher came in.(改为同义句）:He didn't go home until his teacher came in.
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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