he should have know that the police would never allow this sort of thing.
题目
he should have know that the police would never allow this sort of thing.
这里为什么要用would的呢?不用行吗?这总是不加would等情态动词?
答案
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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