Why is incorrect to say, "Fueron vacaciones geniales"? According to the quiz, one must say, "Fueron unas vacaciones geniales"
You need the article "a" in plural: "unos/unas", the same way you need it in English: "It was a great vacation". It would be incorrect to say "It was great vacation". The same applies to the Spanish sentence, you cannot omit the article.
I hope this helps,
The hint says use "un" for some, but in fact the answer uses "unas" for some. I would have answered "unas" but I was more confused than helped by this "hint". I guess a more useful hint should say "Use a form of "un" to indicate "some"".
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