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

I'm really at a loss! 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 who can it be i am quite at a loss to guess. I'm completely at a loss怎么翻啊 两个副词啊at a loss是副词啊 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 i'm at a complete loss.i'm looking for some sugar. There are five pairs___, but I'm at a loss which to buy. 答案是什么快快 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 at a complete Anything can i do for you?yes.i 'm at a complete loss.i'm looking for sugar at a loss I was a at a bit of a loss I’m completely at a loss the know what to do next,what should I do then? I am qnite at a loss what to I am at a loss for ouraffection什么意思啊.. There are three kinds of dictionaries here,but I'm at a loss which (to choose from) 为什么有from? 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