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    Experts have found that the disease will lead to a greater increase in the number of sufferers unless seriously when the symptom first appears. A. treated B. having treated C. be treated D. to be treated 【查看更多】

     

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    Experts have found that the disease will lead to a greater increase in the number of sufferers unless ______ seriously when the symptom first appears.

    A. treated                         B. having treated           C. be treated                 D. to be treated

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