c'est toi qui les as

you're the one who... them

→ ce
phrase Rare #45,273
you're the one who... them Used to emphasize that you are the person who performed an action involving them. The phrase is normally followed by a past participle, such as appelés, faits, prises, or écrits; les means “them.”
FR: C'est toi qui les as achetés ?
EN: Are you the one who bought them?

C'est toi qui les as écrits, ça doit être bien.

You’re the one who wrote them, so they must be good.

— Parle avec elle (2002)

C'est toi qui les as appelés?

Did you call them?

C'est toi qui les as faits?

Did you make them?

— La Vie d'Adèle - Chapitres 1 et 2 (2013)

C'est toi qui les as prises?

Did you take these?