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________ rivers and lakes have caused many fish ________.

[  ]

A.Have been polluted; die away

B.Being polluted; die out

C.Polluted; to die away

D.Polluted; dying out

答案:
解析:

句子的意思是“受到污染了的河流与湖泊已经引起许多鱼的绝迹。”第二空为句型cause...todo...


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