1.When did you invent the strange machine 2.Where do people plant the trees (都改为被动语态)
题目
1.When did you invent the strange machine 2.Where do people plant the trees (都改为被动语态)
答案
When was the strange machine invented by you?
Where are the trees planted?(我认为本句应该用一般过去时态,也就是are改成were)
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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