The rivers will become dirtier and dirtier we take action to protect them.A．since B．if C．until D．unless 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．since

B．if

C．until

D．unless

解析

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A．if