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Source OG 10:
196. 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
Why is D prefered over A?
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Saurabh Malpani