求教prep08 p2 211题

cq505836696

211. (GWD-5-Q34)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(D)

E.thereby, it was made easier for the ant



题目释义：Many entomologists say that campaigns.....have failed...., thus making....


这题楼主实在没有理解划线部分的意思，题目是说一些生物学家认为在美国消灭火蚁的方法是失败的，因为使用的化学物质只有在什么情况下才会有效，因此。。。
D选项中的It指代什么呢，选项中说什么对蚂蚁的扩散更容易了。。。，求解惑

HarrisZheng

it 是形式宾语

你不是没读懂划线的意思 而是前面的意思没读懂 因为化学物质只能杀死蚂蚁的天敌，因此反而让蚂蚁扩散变得更容易

michaelmay17

划线的意思是因为那些化学物质只能把蚂蚁的天敌有效的消灭的而不能有效地消灭蚂蚁

d的it指代后面的不定式to spread在gmat中it一般指代不定式或指代that从句

cq505836696

谢谢两位 谢谢了 现在看懂了 嘿嘿