there are five pairs to choose from ,but i am at a loss which to buythere are five pairs______,but i'm at a loss which to buy.choose from 为什么不能选for choosing
问题描述：
there are five pairs to choose from ,but i am at a loss which to buy
there are five pairs______,but i'm at a loss which to buy.
choose from
为什么不能选for choosing
答
翻译过来是。这里有五双可以选
如果说你选FOR CHOOSING 说白了你如果翻译过来就是
这里有五双 选择的某物 FOR DOING 成了那个物体的修饰词 而不是你的动作。
答
there be +inf ，这里强调的是five pairs ，而不是供选择
答
to do sth 是不定式~表能力（能够） 目的~
有五双可以选择,我却不知道选哪双.
for doing sth 表“为了.”