I am at a loss what to do 中what to do 做什么成分

I am qnite at a loss what to I am at a loss what to do 中what to do 做什么成分 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 do not know what I can do about it.I am completely at a loss 翻译一下这句话 I am at a loss for ouraffection什么意思啊.. Sorry,this is my first time to make an IDD,call I am ____a.at a loss how to dob.at a loss to do c.at a loss what to dod.on a loss选C 为什么?需要解析和翻译 who can it be i am quite at a loss to guess. I was at a loss what to do.I have forgot which way to take. I was still at a loss what to say这里at a loss做什么成分 为什么可以直接跟What to say at a loss for what to do ,at a loss what to do都可以吗? I'm really at a loss! I am at.loss about .部分应该填什么啊 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 completely at a loss the know what to do next,what should I do then? 英语翻译I am still at a loss whether to believe it & what to do after a night's thinking!God help me!If there were someone who could guaid me!十分感谢高手们的相助. there are five pairs to choose from,but i am at a loss which to buy 意思 SOS!at a loss后面可以加名词吗?When I saw that the house was on fire I was at a loss+what to do这种表达可以吗?at a loss后面可以再接名词（或名词性从句）吗?还是表达成：at a loss of what to do?