How come it is "how come" and not "how comes"? Orig:Is "how come" slang?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Game 3 Looping

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Chapters
00:00 How Come It Is &Quot;How Come&Quot; And Not &Quot;How Comes&Quot;? Orig:Is &Quot;How Come&Quot; Slan
00:52 Accepted Answer Score 16
01:44 Answer 2 Score 14
02:17 Answer 3 Score 2
03:08 Answer 4 Score 2
03:34 Thank you

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Full question
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Tags
#wordusage #slang

#avk47