求助大神们OG12--86

modernre

86. The results of the company’s cost-cutting measures    are evident in its profi ts, which increased 5 percent
during the fi rst 3 months of this year after it fell over   the last two years.

(A) which increased 5 percent during the fi rst   3 months of this year after it fell

(B) which had increased 5 percent during the fi rst   3 months of this year after it had fallen

(C) which have increased 5 percent during the fi rst   3 months of this year after falling

(D) with a 5 percent increase during the fi rst   3 months of this year after falling

(E) with a 5 percent increase during the fi rst   3 months of this year after having fallen

正确答案是C项，但是如果把C项这里的falling改成had fallen in the last two years，是否正确

justabeginning

对，这是强调句式，it无所指。

modernre

明白了，那么这里的falling就并不是一个对比了，谢啦，还有个问题想请教您
3. Although various eighteenth- and nineteenth-century
American poets had professed an interest in
Native American poetry and had pretended to imitate
Native American forms in their own works, until almost
1900, scholars and critics did not begin seriously to
study traditional Native American poetry in native
languages.
(E) it was not until almost 1900 that scholars and
critics seriously began studying
E项中的it指代什么呢，还是这是一个强调句型
谢啦

justabeginning

如果谓语是完整的，那么需要补出主语。补出以后虽然正确了，但依然是累赘的。