Historians agree that early American Indians came from Siberia,______ a long-vanished land bridge across the Bering Strait.
A.cross B.crossing C.crossed D.to cross正确答案B
Historians agree that early American Indians came from Siberia,______ a long-vanished land bridge across the Bering Strait.
A.cross B.crossing C.crossed D.to cross正确答案B
