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The speaker, in their stupefaction, leaves the sentence trail off. Would it be:

What on earth...?!

Or:

What on earth--?!

Thank you kindly.

M. Knight
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1 Answers1

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An ellipsis is more appropriate. According to GrammarBook.com, an ellipsis is used when omitting a word or phrase, whereas a dash is more appropriate for adding emphasis or an interruption in the current chain of thought/speech.

More on ellipses: http://www.grammarbook.com/punctuation/ellipses.asp

More on dashes: http://www.grammarbook.com/punctuation/dashes.asp

AffableAmbler
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