Have 有 ever been to the zoo -Yes.I went there last summer.I saw many kingds of animals there .
题目
Have 有 ever been to the zoo -Yes.I went there last summer.I saw many kingds of animals there .
Have you ever been to the zoo -Yes.I went there last summer.I saw many kingds of animals there .
答案
你去过动物园吗?
——去过,去年夏天时候去的.我在那看到好多种动物.
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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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