Definition: not knowing what to do Level: C2
我不知道如何解释他的失踪。
I'm ___at ___a ___loss to explain his disappearance.
现在我完全不知道接下来该写什么。
And now I am competely ___at ___a ___loss what to write next.
当她面临这个艰难的决定时，她不知所措。
She was ___at ___a ___loss when faced with the difficult decision.
