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                题目内容
                (郑州工程技术学院-大学英语1)
            
            
                The problem is () it may take time for new facts to become available.     
(A)that
(B)how
(C)what
(D)if
                    
                    
                    
                
                
                
            
        (A)that
(B)how
(C)what
(D)if
参考答案