an experimental public school called the KIPP Academy opened (2. at/ on) _____ the fourth floor of Lou Gehr Junior High SchoolĐoạn văn12/500an experimental public school called the KIPP Academy opened (2. at/ on) _____ the fourth floor of Lou Gehr Junior High SchoolNhập câu trả lời ở đâyXác nhậnGiải thíchĐáp án đúng là: on