SaSan has no pens(改为一般疑问句）They went to school(一般疑问句）
题目
SaSan has no pens(改为一般疑问句）They went to school(一般疑问句）
We pack our schoolbay eveydoy(否定句）
Pat bought a book last night(否定句） He takes a man's arm(一般疑问句）They last their wallot yesterday(一般疑问句）
答案
Doesn't SaSan have pens?Did they go to schoolWe don't pack our schoolbag eveyday Pat didn't bring a book last nightDoes he take a man's armDid they last their wallot yesterday （最后一句感觉楼主单词有...
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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