It happened that father had sent us upstairs because he thought he would be able to lock the door-wh
题目
It happened that father had sent us upstairs because he thought he would be able to lock the door-which was twenty feet away-before the animal reached it
which was twenty feet away是修饰谁的?是 那个动物距离20英尺远 还是 那个门距离20英尺远?which was twenty feet away应该还原到哪》?
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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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