How many legs does an octopus have?
How many legs does an octopus has?
If octopus is singular, why do we use "has" instead of "have"?
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"has" is incorrect in this structure. The correct sentence is:
The only way "has" can be correct is in this structure:
When we use the auxilary verb "do" in the interrogative it is always "have" with either plural or singular subject.