Influenza H1N1 is an illness that can result in death unless left ________ in time.
A.treat B.to treat C.treating D.treated
Influenza H1N1 is an illness that can result in death unless left ________ in time.
A.treat B.to treat C.treating D.treated
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。]