GWD5-Q34，一个小问题

kitebird

也就是22套里第3套的34题

GWD5-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.

1. which made it easier for them
2. which makes it easier for it
3. thus making it easier for them
4. thus making it easier for the ant
5. thereby, it was made easier for the ant

有一个小问题，because和thus不重复吗？一开始以为重复就把C、D排除了：（

后来也觉得D是正确的，就是还有这么个小疑问。

是不是因为thus是副词，不能连接两个句子，所以也就跟because谈不上重复了？？？

sunshinerab

because是表原因，Thus表结果，谈不上重复不重复啊。

yxas

because 是修饰动词have failed...thus 是修饰全句...

Karenzz

引用：
because和so不能连用的关键原因不在于语义重复，而在于两个句子只需要一个连词即可。
这里thus不是连词，所以可以这么用.