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

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

题目
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
答案
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
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