og 179

richard99999z

179. During the early years of European settlement on a continent that was viewed as "wilderness" by the newcomers. Native Americans, intimately knowing the ecology of the land. were a help in the rescuing of many Pilgrims and pioneers from hardship, or even death.
(A) Native Americans, intimately knowing the ecology of the land, were a help in the rescuing of
(B) Native Americans knew the ecology and the land intimately and this enabled them to help in the rescue of
(C) Native Americans, with their intimate knowledge of the ecology of the land, helped to rescue
(D) having intimate knowledge of the ecology of the land. Native Americans helped the rescue of
(E) knowing intimately the ecology of the land, Native Americans helped to rescue

In B, after the second "and",there is a "this". Although "this" is unusually to express a sentence, however, "this" here will express "the land" or "the ecology and land" if there is no comma.

259. Five fledgling sea eagles left their nests in western Scotland this summer, bringing to 34 the number of wild birds successfully raised since transplants from Norway began in 1975.
(A) bringing
(B) and brings
(C) and it brings
(D) and it brought
(E) and brought

"ing"can express the statement of the former sentence, so A is right

B bings

B C brings

C D it

D E brought the two action is unparalled so the explaination says "cause-and-effect" relationship