"His daughters eat only pasta."
Translation:ילדותיו אוכלות אך ורק פסטה.
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It intensifies the רק making it emphatic.
It's an emphatic only or exclusively: http://www.morfix.co.il/en/%D7%90%D7%9A%20%D7%95%D7%A8%D7%A7
Both are correct, אך ורק being more emphatic. The thing is that Duo always corrects to the closest correct answer, that's why it shows that as a typo, thinking you only meant to write רק but added another letter by mistake. It doesn't really know the difference between typing with a keyboard and word bank, and that you only used the word tiles.