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                题目内容
                (河南财经政法大学大学英语(4))
            
            
                First published in 1927, the chart remains an ______ source for researchers.
A.identical
B.inevitable
C.intelligent
D.indispensable
                    
                    
                    
                
                
                
            
        A.identical
B.inevitable
C.intelligent
D.indispensable
参考答案
 
                