1 She must be sleeping.（改为否定句)
题目
1 She must be sleeping.（改为否定句)
2 We have three maths classes on Wednesday.(改为一般疑问句)
3 Betty has never visiter Palace..(改为一般疑问句)
4 I was listening to the music as thme..(改为一般疑问句)
5 I had breakfast.David arrived at my house.(用when连接两个句子)
6 Helen had supper.Helen went to bed.(用after连接两个句子)
答案
she mustn't be sleeping
Do we have three maths classes on Wednesday
Has Betty never visite Palace?
was I listening to the music as
I had breakfast when David arrived at my house
Helen went to bed after she had supper
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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