关于我的变化的英语作文,用be used to 句型!非常着急!
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关于我的变化的英语作文,用be used to 句型!非常着急!
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I used to have a large build and I was short.But after a year's exercise I am much taller and thinner.I used to get up late in the morning and stay up late at night.I know it's bad for my health so I ...
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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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