【题目】Due to the frequent school shootings, the only way the president could imagine ________ such tragedies was to ban guns across the US.
A. preventing B. prevented C. to prevent D. having prevented
在线课程【答案】C
【解析】
考查动词不定式作后置定语。句意：由于校园枪击案频发，总统能想到的防止此类悲剧发生的唯一办法就是在全美范围内禁止枪支。此处是动词不定式作后置定语，故选C。