注意：此页面搜索的是所有试题
题目内容
（河南城建学院-大学英语2）
All that has happened is heart-breaking. In fact, a little more carefulness _____ this tragic event.
A.would have prevented
B.should prevent
C.could prevent
D.must have prevented
A.would have prevented
B.should prevent
C.could prevent
D.must have prevented
参考答案
