I think Il a économisé en secret should have been accepted
Freeform Writing Exercise B1
Your answer is indeed correct! We've now added this missing option to the correct answers.
I hope this is helpful.
Bonne journée !
Yes, en cachette and en secret are synonymous, although en cachette sounds a bit less formal. Note, though, that there's no way every possible way of saying something could be captured in the list of possible answers. So some discretion is always advised.
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