问题
                    
When the newspaper boy got to a blue door, __________, which frightened him away as fast as possible.
                            A:out a fierce dog rushed
B:out did a fierce dog rush
C:out rushed a fierce dog
D:rushed out a fierce dog
                        
                        B:out did a fierce dog rush
C:out rushed a fierce dog
D:rushed out a fierce dog
正确答案是:
                         
                        
                        
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