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题库 / Prep2008E2-SC-211
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.
which made it easier for them
which makes it easier for it
thus making it easier for them
thus making it easier for the ant
thereby, it was made easier for the ant
请看讲解视频
此段话想说“让它（火蚁，单数）更容易扩散。
A B C 代词问题： A C用了them，不可指代单数的火蚁，便成了天敌们的代词，明显不符语义。
B出现了两个it，分别代表不同含义，指代混乱，非优选。
D完美项
E畸形
说的对
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