Duolingo
https://www.duolingo.com/contactDuolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps! Learn languages by playing a game. …
Duolingo Help Center
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Duolingo English Test
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Submit a request – Duolingo Help Center
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Duolingo English Test
englishtest.duolingo.comDuolingo English Test, Certify your English proficiency today! Take the test online anytime, anywhere, Finish in 1 hour and get results in 2 days, Accepted by over 3500 institutions, …