have to 的否定形式是?
题目
have to 的否定形式是?
答案
don't/ doesn't/ didn't have to 没必要相当于 needn't You don't have to go there.= You needn't go there.= You don't need to go there= It is unnecessary for you to go there.你没必要去那
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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