Sơn Đoòng Cave is (36)___________ at the heart of Phong Nha Kẻ Bàng National Park in Quảng Bình Province.
Sơn Đoòng Cave is (36)___________ at the heart of Phong Nha Kẻ Bàng National Park in Quảng Bình Province.
A. to be located
B. locating
C. being located
D. located