I'm at a loss as to what to do and feel lost

I'm at a loss as to what to do and feel lost 这是啥意思?英译中I'm at a loss as to what you mean by saying so! I'm really at a loss! 英语 at a loss 与 at loss原来一直认为是有 at loss 这个短语 如 I `m at loss which to buy.可高考总复习上关于loss的归纳上却出现了 at a loss,如 I am at a loss what to do.和上面一样的结构 .两者等同么?没把 There are five pairs___, but I'm at a loss which to buy. 答案是什么快快 I am qnite at a loss what to we are at a loss as to why.rt,为什么介词as to可省略? I’m completely at a loss the know what to do next,what should I do then? I'm completely at a loss怎么翻啊 两个副词啊at a loss是副词啊 英语题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 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 There are three kinds of dictionaries here,but I'm at a loss which (to choose from) 为什么有from? Visitors may be at a loss as to what to do in a foreign environment. There are 5 pairs ___,but I'm at a loss which to buy.A to be chosenB to choose from C to chose D for choosing i'm at a complete loss.i'm looking for some sugar. I was at a loss what to do.I have forgot which way to take. i'm quite at a loss to guess这里用的介词at到底对不对,有什么依据,这句话怎样翻才好 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?