某英语题目—oil prices are going up almost every day. We really ca
某英语题目
—oil prices are going up almost every day. We really can't take it.
—but for the situation where frequent unrest ________ lately in the Middle East and North Africa, oil prices would not be so high.
为什么横线上填has happened啊?它不是对过去的虚拟麽?
高考生 急~