we ___each other since we were children.(A know B kenw C have known D had known)
题目
we ___each other since we were children.(A know B kenw C have known D had known)
答案
D,自从我们是孩子时,我们就已经知道对方了,说话人的动作从过去一直持续到现在,过去认识,现在还认识.
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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