Examples: I am at a loss who to blame. OR I am at a loss of who to blame. OR I am at a loss on who to blame.
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Rather than [], [of] and [on], I think it should be [as to]:
A clearer way might be to say:
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I think to be absolutely correct there should be a preposition, but common usage seems to indicate you can get away without one. I would tend to say "I am at a loss as to who to blame" |
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