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