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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
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所以because后面可以跟thus，therefore， so这一类的词吗？？
because接的是一个副句，逗号之后是主句。并不需要连词衔接。
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