Keys are used by people （for/with/to opening) the door.
题目
Keys are used by people （for/with/to opening) the door.
哪个对?
答案
Keys are used by people for/to open the door.
钥匙是人们用来开门的.
所以for 对
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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