英语选择30as many as 150 miners died in the accident .If only the mine-owners 空 enough attention to the safety measures!1 paid 2 should pay 3 would pay 4 had paid

英语选择30
as many as 150 miners died in the accident .If only the mine-owners 空 enough attention to the safety measures!
1 paid 2 should pay 3 would pay 4 had paid

选4
虚拟语态,