You ________ all those calculations!We have a computer to do that sort of thing.
题目
You ________ all those calculations!We have a computer to do that sort of thing.
A) needn’t have done
B) must not have done
C) shouldn’t have done
D) can not have clone
答案
A,本不必
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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