what present did you give Tom ____ his birthday.为什么用for,
题目
what present did you give Tom ____ his birthday.为什么用for,
答案
这里的for表示目的,可以翻译成“给.”.这是for的其中一种用法.Yesterday was Sunday.What did you go to school for 这句的for也是同样的用法,“为了什么”的意思.
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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