so his daughter had to take care of the garden and the animals

Question

In Conte de fées (Passé Composé vs Imparfait) we're given the clue so his daughter had to take care of the garden and the animals. with 'devait' given as the correct answer and not 'a dû'. Why is that the case, when in this class it seems to be the opposite way around? It follows the context of her father rarely leaving his bed, and is followed by describing something she would also do once a month. So it seems unlikely to fit the 'we don't know if she fulfilled that obligation' case for using devait.

Accepted Answer

Yes, but as you have described the context, this is a 'classic' use case for imparfait form rather than passé composé - repeated 'habits' of relatively undefined duration/timing, and that is no longer happening.
https://progress.lawlessfrench.comExpressing past habits or repeated actions with the imperfect tense in French (L'Imparfait)