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We must take measures to stop various kinds of pollution ______ the environment gets worse.

A. unless B. until

C. before D. when

C

【解析】

试题分析:考查状语从句连词辨析。A除非,如果不;B直到…才;C在…之前;D当…时;句意:在环境变得更糟糕之前我们必须采取行动来阻止各种污染。根据句意可知C正确。

考点:考查状语从句连词辨析

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