He does not know() A when to do B when to do C where to do D how to do
题目
He does not know() A when to do B when to do C where to do D how to do
答案
He does not know how to do
选择 D
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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