he often does his homework at home 变否定句和疑问句
题目
he often does his homework at home 变否定句和疑问句
请注意often 的位置
答案
Does he often do his homework at home
He doesn't often do his homework at home
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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