i don t think it will be you know how to improve your
题目
i don t think it will be you know how to improve your
i don t think it will be____you know how to improve your Enjlish study
A long after B long before C long since D far form that
答案
B,这是it will be long（a long time）+before + 从句的用法.
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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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