The rivers will become dirtier and dirtier ______ we take action to protect them.A．sinceB．ifC．untilD．unless-初中英语-魔方格

◎ 题干

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

A．since

B．if

C．until

D．unless

◎ 答案

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◎ 解析

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◎ 知识点

根据魔方格专家分析，试题“The rivers will become dirtier and dirtier ______ we take action to protect them.A．sinceB．ifC．untilD．unless…”主要考查了你对【并列连词】，【从属连词】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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