we are at a loss as to why.rt,为什么介词as to可省略?

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weareatalossastowhy.rt,为什么介词asto可省略?weareatalossastowhy.rt,为什么介词asto可省略?weareatalossastowhy.rt,为什么介词

we are at a loss as to why.rt,为什么介词as to可省略?
we are at a loss as to why.
rt,为什么介词as to可省略?

we are at a loss as to why.rt,为什么介词as to可省略?
这里最好别省
we are at a loss 后接that-从句时,as to"关于“作为介词,必须省略.因为介词一般不接that-从句
其结构为:
be at a loss+ that-从句