photo src: www.thebalance.comDuolingo ( DEW-oh-LING-goh) is a freemium language-learning platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam. Duolingo offers all its language courses free of charge. As of November 2016, the language-learning website and app offer 68 different language courses across 23 languages, with 22 additional
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