In the past, many rivers were ______________(污染) seriously, but now they are cleaned up.
2022-05-05 04:53:10 220次 2020年6月江苏省镇江市中考二模英语试卷 根据中/英文提示填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
In the past, many rivers were ______________(污染) seriously, but now they are cleaned up.
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