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Ensure your key matches Aula Internacional Plus 3 (published 2020–present). The original Aula Internacional 3 (pre-2020) has different unit orders and some obsolete vocabulary. Whether you are a self-study enthusiast or a
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This edition is an update to the original series, developed with feedback from over 1,000 teachers to make it more adaptable and digital-friendly. Aula internacional plus 3: Textbook