题目内容

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