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    —The air pollution is terrible.

    — It will be worse ________ we take action to protect the environment.

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

    B

    【解析】

    试题分析：句意：—空气污染很严重。 —情况将会更加严重，除非我们采取措施来保护环境。A. if如果； B. unless除非，如果不；C. until直到……才；D. when当……的时候。句意和词意结合可知，选B。

    考点：考查连词的用法。

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