,but I am at a loss which to buywhich to buy 相当于一个名词 但系表结构在接名词时一般不是要加介词么? I am at a loss 是介词短语作表语后接which to buy怎么没加上介词?

I am qnite at a loss what to I am at a loss for ouraffection什么意思啊.. there are five pairs to choose from,but i am at a loss which to buy 意思 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 five pairs________,but I am at a loss which to buy.A to be chosen B to choose from C to choose D for choosing there are five pairs __________There are five pairs __________,but I am at a loss which to buy.可以填for choosing吗,为什么?choose from. 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 am at a loss what to do 中what to do 做什么成分 who can it be i am quite at a loss to guess. There are five pairs___, but I'm at a loss which to buy. 答案是什么快快 ,but I am at a loss which to buywhich to buy 相当于一个名词 但系表结构在接名词时一般不是要加介词么? I am at a loss 是介词短语作表语后接which to buy怎么没加上介词? I'm really at a loss! I am at.loss about .部分应该填什么啊 I do not know what I can do about it.I am completely at a loss 翻译一下这句话 There are five pairs ,but I am at a loss which to buy.A.to be chosen B.to choose from C.to choose D.for choosing 结束 请问前面的英语句子中,问号处应该填哪个选项? 英语难题啊～求解尽量对各个选项都分析下,特别是B和DThere are five pairs of shoes( ),but i am at a loss which to buyto be chosento choose fromto choosefor choosing 英文看看通不通~Winter,let me at a loss, but I am still fond of this season.冬天，让我困惑，但我仍然喜欢这个季节！ 中文想表达的意思