把下列句子由主动语态改成被动语态,或由被动语态改成主动语态
题目
把下列句子由主动语态改成被动语态,或由被动语态改成主动语态
1.Did Tom repair the car yesterday?
2.The curtain in the room has been taken down.
They___________________________(用所给句型改)
3.Millie has donated $210 to the students in poor areas.
4.Have they built another bridge in their town?
5.You may write the letter in pencil.
答案
was the car repaired yesterday?
they have taken down the curtain in the room.
$210 has been donated to the students in poor areas
has another bradge been built in their town?
the letter may be written by you in pencil
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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