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                题目内容
                (河南大学-大学英语(一))
            
            
                [单选题,3.3分] He had hardly left the building _____ the bomb explode
A.than
B.before
C.when
D.after
                    
                    
                    
                
                
                
            
        A.than
B.before
C.when
D.after
参考答案