They had rushed up to her while she was having a picnic at the edge of a forest with her children an
题目
They had rushed up to her while she was having a picnic at the edge of a forest with her children and tried to steal her handbag.为什么前面的had rushed up是用过去完成时?百度提问里有各种回答,都不是很有说服力.请高手不要复制.
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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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