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Theriverswillbecomedirtieranddirtier

栏目: 练习题 / 发布于: / 人气:7.04K

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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