额~ 我倒觉得是不是at a loss呢
疑问词+to do是一种专有语法结构 相当于名词短语 可代替从句
可以不加介词吧~ 我觉得是同位语从句 就像
I had no idea what he was up to these days.
这样看来 确实与疑问词前的名词或短语有关
I am at loss which to buy
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