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                题目内容
                (桂林理工大学大学英语3)
            
            
                (单选题)The reason for all the changes being made ( ) to us.(本题1.0分)
A.explained
B.had explained
C.was explained
D.were explained
                    
                    
                    
                
                
                
            
        A.explained
B.had explained
C.was explained
D.were explained
参考答案
 
                