The (A) shopkeeper warned the boys don't (B) learn their (C) bicycles against5/20Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction. The (A) shopkeeper warned the boys don't (B) learn their (C) bicycles against (D) his windows.Thedon'ttheiragainstGiải thíchĐáp án B Warn somebody not to do st: Cảnh bảo ai đó không làm gì