求该成被动时态：1whendidshecooksupperyesterday2where did she make them3whose ruler did you borrow
题目
求该成被动时态：1whendidshecooksupperyesterday2where did she make them3whose ruler did you borrow
答案
1whendidshecooksupperyesterday
When was (the) supper cooked yesterday?(有yesterday怎么还用when?)
2where did she make them
Where were they made?
3whose ruler did you borrow?
Whose ruler was borrowed?
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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