Mark the letter A, B, C or D on your own answer sheet to point the word that differs from the other 3 in the situation of primary anxiety in each of the next inquiries. C. hasn't existed in classrooms D. has not been used thoroughly in school rooms HĐ https://on-thi-hk11009.idblogz.com/31008611/top-latest-five-on-thi-giua-hk-1-tieng-anh-12-urban-news