I don't know what I can do about it,I'm completele_____(迷茫、不知所措）用at词组填空

I don't know what I can do about it,I'm completele_____(迷茫、不知所措）用at词组填空

" I don't know what I can do about it,I'm completele (at loss)"
"我不知道该怎么做,我完全茫然不知所措."
at loss 感到困惑不解; 茫然不知所措
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At a loss

at sea