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】

試題分析：考查狀語從句連詞辨析。A除非，如果不；B直到…才；C在…之前；D當(dāng)…時(shí)；句意：在環(huán)境變得更糟糕之前我們必須采取行動(dòng)來阻止各種污染。根據(jù)句意可知C正確。

考點(diǎn)：考查狀語從句連詞辨析

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