be keep
题目
be keep
答案
keep from 阻止,抑制,避开 keep sb.from doing sth.阻止某人做某事 被动语态是be kept from 被阻止,抑制 (be keep from不存在) 看例句你就明白啦：1.His ex-wife had kept him from seeing his children.他的前妻不...
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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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