39.27
题目
39.27
---mary is one of the best students in the class
---_____.
a.so she is and so you are
b.so she is and so are you
c.so is she and so are you
d.so is she and so you are
答案
b正确.So she is省略了后面的one of...
so are you是倒装句
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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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