after he finished to do his homework,he left the classroom改错
题目
after he finished to do his homework,he left the classroom改错
答案
to do 改为 doing
固定搭配：finish doing sth 完成做某事
句意是：他做完家庭作业后离开了教室.
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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