GWD一道语法题，求助，D里it 指借的是什么呀？

20120520 · 发表于 2012-6-11 22:50:58

Many entomologists say that campaigns to eradicate the fire ant in the United States have failed because the chemicals that were used were effective only in wiping out the ant’s natural enemies, which made it easier for them to spread.

A.   which made it easier for them
B.   which makes it easier for it
C.   thus making it easier for them
D.   thus making it easier for the ant （这个IT指的是什么呀？）
E.   thereby, it was made easier for the ant

jeffery2541 · 发表于 2012-6-11 23:34:56

it是形式宾语啊，指的的是后面的不定式to spread。

本贴相关题目 GMATPrep-2008E2-SC-211 | TN-03-SC-34 (CWEK)

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GWD一道语法题，求助，D里it 指借的是什么呀？

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