She had only some damp wood and coal dust but at last she managed to get the fire
题目
She had only some damp wood and coal dust but at last she managed to get the fire
(lighting,lit).
要讲出缘由！
答案
get the fire lit
有一个结构是get sth done,强调被动关系（这里,火是被人点燃的）
至于get sth doing,是让某事一直处于一个状态,是主动关系
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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