问题
                    
The Great Wall is _________________ tourist attraction that millions of people pour in every year.
                            A:so a well-known
B:a such well-known
C:so well-known a
D:such well-known a
                        
                        B:a such well-known
C:so well-known a
D:such well-known a
正确答案是:
                        
                        
                        
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