We must take measures to stop various kinds of pollution the environment gets worse.A. unless B. untilC. before D. when 题目和参考答案——青夏教育精英家教网—

题目内容

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

A. unless B. until

C. before D. when

【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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