Learn what "who could do this" means, when people say it, and how to use it naturally in English.

It expresses shock and disbelief and asks who might be responsible.
From Mysterious Murderer, Episode 9
Someone reacts to a terrible event by asking who could have done it.
Use it when reacting to something awful or unbelievable. It is natural in dramas and emotional conversations, but it is not a direct factual question.
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