there are five pairs to choose from ,but i am at a loss which to _英语解答

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

人气：431 ℃　时间：2020-03-26 04:37:45

解答

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.”