When did you know it?
题目
When did you know it?
__________me yesterday.
Until you told
Not until you told
Not until did you tell
Till when you told 选哪个
答案
Not until you told
I did not know it until you told me yesterday.
Not until you told me yesterday did I know it.
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.
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