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                题目内容
                (大学英语1)
            
            
                4.______a reply,he decided to write again.
A.Not receiving
B.Receiving not
C.Not having received
D.Having not received
                    
                    
                    
                
                
                
            
        A.Not receiving
B.Receiving not
C.Not having received
D.Having not received
参考答案
 
                