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．a(chǎn)re confirmedD．have been confirmed
D
考查時(shí)態(tài)語(yǔ)態(tài)。So far與現(xiàn)在完成時(shí)連用，排除AC。句意：到目前為止一共19個(gè)案例已經(jīng)被確認(rèn)了，另外36個(gè)人正在被治療。故應(yīng)該使用被動(dòng)語(yǔ)態(tài)。D正確。
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