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                题目内容
                (国家开放大学英语语法)
            
            
                She has no idea of what the book is about. She ____ have read it carefully. 
A.mustn’t
B.can.t
C.shouldn.t
D.needn.t
                    
                    
                    
                
                
                
            
        A.mustn’t
B.can.t
C.shouldn.t
D.needn.t
参考答案