Both of my parents were born in 1970.Both my parents were born in 1970 .My parents were both born
题目
Both of my parents were born in 1970.Both my parents were born in 1970 .My parents were both born
IN 1970,请教高手both的这三种用法都对吗?
答案
都是对的呐.
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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