HAS or HAVE

[Cosmo]

Which would you say?

1. I'm sorry that it's you who has to tell her.

2. I'm sorry that it's you who have to tell her.

All of my native English speaking friends say "has", but some ESL friends are saying this is gramatically incorrect.

[Mister Micawber]

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In such a cleft sentence/clause, 'it' is just a place-holder for the clause: '[I'm sorry that] who has to tell her is you'. 'Have' will not work here.

-- But your question is, 'Which would you say?' Well, I am likely to say either.
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Native English teacher at Mister Micawber's