The city has proposed a number of water treatment and conservation projects the cost of which raises water bills high enough so that even environmentalists are beginning to raise alarms.
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Athe cost of which raises water bills high enough so that
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Bat a cost raising water bills so high that
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Cat a cost which raises water bills high enough so
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Dwhose cost will raise water bills so high that
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Ewhose cost will raise water bills high enough so that
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正确答案: D