Thirty of the cattle__caught the dis-ease.A.is B.are C.has D.have

问题描述:

Thirty of the cattle__caught the dis-ease.A.is B.are C.has D.have

D.牛群里三分之一的牛得了这种病
cattle为牛群,复数,三分之一的牛群的牛也是复数
生病是主动生的病,be caught为被动语态
所以选择主动而且是复数的谓语动词的have