students must hand in their homework on time every day.(改为被动语态）
题目
students must hand in their homework on time every day.(改为被动语态）
student' homework ___ ___ ___ ___on time every day.
答案
students' homework must be handed in on time every day.
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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