I will write a preface when I have finished the book.和 I will write a preface when I finish the book
题目
I will write a preface when I have finished the book.和 I will write a preface when I finish the book 的区别,
答案
I will write a preface when I have finished the book.我完成这本书之后,就写序言.I will write a preface when I finish the book.我完成这本书,就写序言.前一句强调完成,语气更重一些,也可以暗示这本书耗时较多....
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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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