Boss,must I finish typing this letter today?No,you__.You may finish it tomorrow.
题目
Boss,must I finish typing this letter today?No,you__.You may finish it tomorrow.
A.needn't B.mustn't C.don't D.won't
答案
needn't
用must来提问,如:Boss,must I finish typing this letter today?
肯定回答:Yes, you must.
否定回答:No,you need't. 或: No, you don't have to.
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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