What's your birthday, Ann? - It's ......................... A. on the thirty-one of July B. on the thirty-first of July C. on July the thirty-one D. in July the thirty-firstĐoạn văn39/60What's your birthday, Ann? - It's .........................on the thirty-one of Julyon the thirty-first of Julyon July the thirty-onein July the thirty-firstGiải thíchChọn B