一般时 过去时 将来时 80词作文各一篇
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一般时 过去时 将来时 80词作文各一篇
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A TRIP TO the COUNTRY 乡村游记 One Sunday my mother (Mother) had (made) me take my little young brother to the a trip to the country.She bade me take good care of him.While we were walking along the r...
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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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