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    So far a total of 19 cases______ and another 36 people are being treated on the assumption that they are infected with Legionnaires Disease.


    1. A.
      were confirmed
    2. B.
      have confirmed
    3. C.
      are confirmed
    4. D.
      have been confirmed
    D
    考查时态语态。So far与现在完成时连用，排除AC。句意：到目前为止一共19个案例已经被确认了，另外36个人正在被治疗。故应该使用被动语态。D正确。
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