My friend failed to meet me at the station,and I was at a loss what to do _____ the circumstances.

问题描述:

My friend failed to meet me at the station,and I was at a loss what to do _____ the circumstances.
A.under B.on C.for D.from
为什么选A 怎么翻译后半部分

固定搭配under the circumstances,在某种条件下
at a loss手足无措
在那种情况下我真的是手足无措