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                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