Viet Nam reported the Thien Duong it is longest cave in that is36/36Viet Nam/reported/ the /Thien Duong/ it is/ longest cave/ in /that/is/ ___________________________________________________________________Nhập câu trả lời ở đây0/3000 ký tựGiải thíchĐáp án: It is reported that Thien Duong is the longest cave in Viet Nam.