there are five pairs to choose from ,but i am at a loss whic

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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

优质解答：

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.”

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