As you worked late yesterday,you ___ have come this morning.
题目
As you worked late yesterday,you ___ have come this morning.
A.needn't
B.mayn't
C.can't
D.mustn't
那D
musn't也可以翻译成不必啊..
答案
A.（不必）
意为：由于你昨天工作到很晚,你今天早晨不必来.
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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