has been in和has been at的区别
题目
has been in和has been at的区别
has been in.has been at.has been to.has gone to它们的区别
答案
has been in（去过某地）后接大地方
has been at（去过某地）后接小地方
has been to（去了某地）回来与否不晓得
has gone to（去了某地）还未回来
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．
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