Having been attacked by terrorists, _____. 求翻译并解释
问题描述：
Having been attacked by terrorists, _____. 求翻译并解释
A. doctors came to their rescue B.the tall building collapsed
C. an emergency measure was taken D. warning were given to terrorists
答案为B.求详细解释其他三项排除的原因!求详解!万分感谢!
答
非谓语动词作状语时,主语要与非谓语动词构成主动关系或是被动关系.题干是“被*攻击之后,_______”,四个选项中的主语分别是A doctors(医生)；B the tall building(高楼);C an emergency measure(一个紧急措施)...