Digital English Language Learning Market 2021-2027: Industry showing Huge Growth in Future by CENGAGE LEARNING HOLDINGS II, INC, DUOLINGO, EF EDUCATION FIRST, ELSA, CORP, HOUGHTON MIFFLIN HARCOURT – KSU | The Sentinel Newspaper – KSU | The Sentinel Newspaperon March 12, 2021 at 14:49 on March 12, 2021 at 14:49 Learning EnglishLearning English