The rivers will become dirtier and dirtier ______ we take action to protect them - 初中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

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

A．since

B．if

C．until

D．unless

答案

解析

since由于，自从……以来；if 是否，如果； until直到；unless除非，如果不。句意：如果我们不采取措施保护他们，这些河流会越来越脏。结合语境可知选D。

核心考点

试题【The rivers will become dirtier and dirtier ______ we take action to protect them】；主要考察你对从属连词等知识点的理解。[详细]

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