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Theriverswillbecomedirtieranddirtier

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问题详情:

Theriverswillbecomedirtieranddirtier

The rivers will become dirtier and dirtier ______ we take action to protect them.

      A. since       B. if         C. until           D. Unless

【回答】

D

知识点:连词

题型:选择题

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