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
网友回答
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。