问题
                    
(2013·高考湖南卷)Not once________to Michael that he could one day become a top student in his class.
                            A:occurred it
B:it did occur
C:it occurred
D:did it occur
                        
                        B:it did occur
C:it occurred
D:did it occur
正确答案是:
                         
                        
                        
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