【题目】I also felt guilty, as all fathers do at a time like this, wondering whether there was anything I ______ to have prevented this situation from rising.
A. would do B. could do
C. can do D. could have done
在线课程【答案】D
【解析】
试题分析：考查虚拟语气。句意：我也感到内疚，就像所有的父亲在此刻会做的那样，我会质疑我是否之前能做些什么来阻止这件事。这些动作过去并没有发生，故是对过去行为的虚拟。故选D