被动语态改写英语句子
题目
被动语态改写英语句子
This song is heard ( )now.
A singing B to sing C sang Dsung
The students in Class 4 didn't sweep the floor last Friday.
Did he take an umbrella just now?
Did that factory make TV sets in 1999?
后三个句子改成被动语态
答案
This song is heard ( )now.A singing现在听到这首歌正在被唱.The students in Class 4 didn't sweep the floor last Friday.改：the floor wasn't swept last friday by the students in class 4.Did he take an um...
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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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