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 ..once existed
(b)were mgrating 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.
The OA is D obviously because of the tense.
My doubt is should the adverb once be placed before the verb existed or after the verb existed? Can someone throw some light on were the adverb should be placed. Would be glad!
(a)have migrated ..once existed
(b)were mgrating 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.
The OA is D obviously because of the tense.
My doubt is should the adverb once be placed before the verb existed or after the verb existed? Can someone throw some light on were the adverb should be placed. Would be glad!
