英语翻译
题目
英语翻译
4农夫已经有半个小时不在农场了.5我自从前天就认识她了
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1He has learned English for ten years2Chilren have learned dancing two years ago3How long has he been an English teacher?4The farmer hasn't been in farm for half an hour5I have known her since the da...
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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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