Having been attacked by terrorists, _____. 求翻译并解释A. doctors came to their rescue B.the tall building collapsedC. 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!

Question

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!

Answer 1

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“被恐怖分子攻击之后,_______”,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)；D warning(警告)
当然,可排掉C,D ,因为它们和“被恐怖分子攻击”构不成主动或被动关系,只用A,B可以构成这种关系.
A“医生去救他们（恐怕分子）”（不合实际） ；B“高楼倒塌”,所以只有B选项符合.