1. Due to the frequent school shootings, the only way the president could imagine ________ such tragedies was to encourage teachers to carry guns.
A. preventing B. to prevent
C. prevented D. having prevented
【答案】B
【解析】
【详解】考查非谓语动词。句意：由于校园枪击事件频繁发生，总统所能想到的防止此类悲剧发生的唯一方法就是鼓励教师携带枪支。the president could imagine是定语从句修饰先行词the only way，此处是动词不定式作后置定语，修饰名词way，way to do sth. (做某事的方法)。故选C。
