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【题目】The air pollution is so terrible. It will be worse ____ we do something to protect the environment.

A. ifB. when

C. unlessD. since

【答案】C

【解析】

考查连接词。句意:空气污染太严重。除非我们采取保护措施,否则环境将变得更糟。A. if 表示“假设”、“如果”,可引导条件状语从句;B. when 表示“当… 时候”,引导时间状语从句;C. unless 表示除非否则…”D. since 作连词时,表示因为既然,引导原因状语从句。根据句意可知选C

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