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としたことが and ともあろうものが are used to express the surprise of the speaker toward the (bad) behaviour of someone. With 私, it expresses something around the line of "Who could have thought I/someone like me/someone of my standing/someone of my position (would do such a thing)" Here are some examples from the 和英大辞典： 君としたことが, とんだへまをしでかしてくれたものだ. You, of all ...
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