what are you doing for vacation?和what are you going for vacation?的区别
题目
what are you doing for vacation?和what are you going for vacation?的区别
答案
What are you going for vacation?是错的,要改为：Where are you going for vacation?（你去哪里度假?） 或what are you going to do for vacation?（假期你打算做什么?） 意思和 What are you doing for vacation?...
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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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