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.
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Ahave migrated to the Western Hemisphere over a bridge of land that once existed
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Bwere migrating to the Western Hemisphere over a bridge of land that existed once
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Cmigrated over a bridge of land to the Western Hemisphere that once existed
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Dmigrated to the Western Hemisphere over a bridge of land that once existed
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Ewere migrating to the Western Hemisphere over a bridge of land existing once
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正确答案: D