MY brother is playing football in the park.一般疑问句用现在进行时单项怎么做.特殊疑问句和否定句怎么做
题目
MY brother is playing football in the park.一般疑问句用现在进行时单项怎么做.特殊疑问句和否定句怎么做
答案
Is my brother playing football in the park?
What is your brother doing in the park?
My brother is not playing football in the park.
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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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