把下列句子改为被动语态.
题目
把下列句子改为被动语态.
1.He often plays football.
2.Did he buy the apples?
3.I can't finish the work.
4.I will give him a new pen.
5.When do people often plant tress?
答案
Football is often played by him.Were the apples bought by him?The work can't be finished by me.A new pen will be given to him by me.When are the trees often planted by people?
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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