They had got everything ready before i arrived. After he had wor
题目
They had got everything ready before i arrived. After he had worked in the factiry for ten years , he went abroad. 我想问一下 不说有个语法说有after或before这类明显表示时间的词不用完成时表示两个动作的前后吗?
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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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