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  3. The water in this part of the river has been contaminated by sewage(污水). (200...

The water in this part of the river has been contaminated by sewage(污水). (200...

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问题 The water in this part of the river has been contaminated by sewage(污水). (2002年真题)（）
选项 A.polluted
B.downgraded
C.mixed
D.blackened
答案A
解析
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