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Purba, N. A., and M. . Saragih. “PENINGKATAN HASIL BELAJAR BAHASA INGGRIS MELALUI APLIKASI DUOLINGO DALAM PEMBELAJARAN ONLINE DI TENGAH COVID-19 PADA SISWA SMP KATOLIK DELIMURNI DELITUA”. Jurnal Ilmiah Aquinas, vol. 5, no. 1, Feb. 2022, pp. 32-38, doi:10.54367/aquinas.v5i1.1585.