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本贴相关题目 OG (FOZU)

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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.

Ahave migrated to the Western Hemisphere over a bridge of land that once existed
Bwere migrating to the Western Hemisphere over a bridge of land that existed once
Cmigrated over a bridge of land to the Western Hemisphere that once existed
Dmigrated to the Western Hemisphere over a bridge of land that once existed
Ewere migrating to the Western Hemisphere over a bridge of land existing once