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I am trying to understand the dialogue being spoken by the narrative character
on the page below, specifically the fourth line of dialogue from the right in
the picture.

> 「……さっきは何で、あんなことを？」

What is the implied-verb represented by the sentence-ending を in the above
sentence, or is there a trick to figuring out what that verb might be, as
mentioned [here](https://japanese.stackexchange.com/questions/1209/does-the-
particle-%E3%82%92-wo-have-a-special-use-when-at-the-end-of-a-sentence) and
[here](https://japanese.stackexchange.com/questions/41500/sentences-ending-
in-%E3%82%92)？

[![enter image description
here](https://i.stack.imgur.com/hYxgo.jpg)](https://i.stack.imgur.com/hYxgo.jpg)
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question
verbs particle-を reading-comprehension sentence-final-particles
What is the implied-verb represented by the sentence-ending を in the following context？
> 何で、あんなことを?  
>  Why did you ... such a ...?

If you understand the story correctly, the implied verb should be self-
evident. What happened to him a moment before (さっき)? What is her response to
this question?

The omitted verb is する/やる ("to do").

> 何で、あんなことをした(んだ)?  
>  Why did you do such a thing?

Judging from what's written in this page, あんなこと ("such a thing") refers to her
(mock) attempt to kill the speaker with a knife.
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answer