So far a total of 19 cases______ and ano...

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 confirmed

B．have confirmed

C．are confirmed

D．have been confirmed

D 【解析】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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