There are five pairs of shoes_____,but i'm at loss which to

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There are five pairs of shoes_____,but i'm at loss which to buy.
A.to choose from B.for choosing 为什么选A不选B?

to choose from 为不定式做后置定语.加一个from 更能体现出有一个范围可供选择.
这是字典上的权威例句：
We have many patterns in stock foryou to choose from.
我们有多种现存的式样供你选择.
请点击下面的“选为满意答案”按钮,
再问：能不能说for choosing from??????????????
再答：不可以哦。 There are five pairs of shoes (for me) to choose from. 其实是省略是for me的。

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