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H5N1 Bird Flu can result in death unless left ____ in time.H5N1 Bird Flu can result in death unless left ______ in time.A.treat B.to treat C.treating D.treated为什么?这句话的意思?left算是什么用法

题目详情
H5N1 Bird Flu can result in death unless left ____ in time.
H5N1 Bird Flu can result in death unless left ______ in time.
A.treat B.to treat C.treating D.treated
为什么?这句话的意思?
left算是什么用法
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答案和解析
H5N1禽流感能致人死亡,除非得到及时救治.
treated 救治的主语是“人”,所以用被动形式,被治疗.