1000sc-444

444. It is possible that Native Americans originally have migrated to the Western Hemisphere over a bridge of land that once existed between Siberia and Alaska.

(A) have migrated to the Western Hemisphere over a bridge of land that once existed

(B) were migrating to the Western Hemisphere over a bridge of land that existed once

(C) migrated over a bridge of land to the Western Hemisphere that once existed

(D) migrated to the Western Hemisphere over a bridge of land that once existed

(E) were migrating to the Western Hemisphere over a bridge of land existing once

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