I put in "Le lapin EST disparu" and I was marked as wrong. "A paru" was given as the only correct answer.
With the verb "disparaître" you can only use the auxiliary "avoir" (just like paraître) as mentioned in the lesson:
"These derivatives follow the same pattern as connaître and paraître:
reconnaître (to recognise / to admit) -> reconnuméconnaître (to misjudge / to not know well) -> méconnudisparaître (to disappear) -> disparucomparaître (to appear in court) -> comparu"
Only "apparaître" can use both "être" and "avoir" in Le Passé Composé: Conjugate apparaître in the compound past in French (Le Passé Composé)
"The French verb apparaître is very unusual in Le Passé Composé (Indicatif), in that it can take either avoir or être as its auxiliary."
I hope this si helpful.
Bonne journée !
Above pasted from the lesson -- Paraître can use avoir or être as an auxiliary depending on the context.
"The rabbit has appeared" I would expect "avoir" but I can see "a state" of being "in sight" as to why you saw "être" as appropriate.
Hope this helps.
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