How Duolingo's new gamification mechanism convinced me to pay, by Shengyu Chen
Por um escritor misterioso
Descrição
I have been a Duolingo power user for 3 years now. My longest streak on Duolingo is 345 days (till this very day, I am still impressed by myself with that ;) ). I never paid a dime during that time…
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por adulto (o preço varia de acordo com o tamanho do grupo)
