Word多久duōjiǔMeaninghow longPart of speechadverbPronunciationCourseHardcore ChineseLessonLesson 5Usages of duōjiǔ你nǐ 认识rènshi 她tā 多久duōjiǔ 了le?nǐ rènshi tā duōjiǔ le?How long have you known her?