There are three kinds of dictionaries here,but I'm at a loss which (to choose from) 为什么有from?

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There are three kinds of dictionaries here,but I'm at a loss which (to choose from) 为什么有from?

There are three kinds of dictionaries here,but I'm at a loss which (to choose from) 为什么有from?
There are three kinds of dictionaries here,but I'
m at a loss which (to choose from) 为什么有from?

There are three kinds of dictionaries here,but I'm at a loss which (to choose from) 为什么有from?
后面省略了“these dictionaries”,choose From是词组,表示从……中选择

at a loss from 是词组,对。。不知所措