GRE Text Completion Question 1812
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Source: CQ
A certain additive put in gasoline to reduce air pollution is actually (i)_____ groundwater, a finding that shows that even the most well-intentioned fixes can sometimes (ii)_____.
| Blank(i) | Blank(ii) |
|---|---|
| A contaminating | D prevail |
| B purifying | E backfire |
| C saturating | F reciprocate |