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    精英家教网 > 初中英语 > 题目详情

    【题目】—The haze will be a serious problem ____ we take action to solve it .

    —Sure it is. I think everyone should do something for it.

    A. since B. if C. until D. unless

    【答案】D

    【解析】

    句意：——雾霾将是一个严重的问题，除非我们采取行动来解决它。——当然是。我认为每个人都应该为此做点什么。考查连词辨析题。A. since既然，表原因；B. if如果，表条件；C. until直到，表时间，多与not连用；D. unless除非，表条件。本句是条件状语从句，根据句意语境，可知unless符合句意，故选D。

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