题目

Influenza H1N1 is an illness that can result in death unless left ________ in time. A.treat  B.to treat  C.treating  D.treated 答案:D [句意:甲流感是一种如果不及时治疗会引起死亡的疾病。H1N1与treat 为被动关系,因而选D。]
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