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                题目内容
                (国家开放大学 人文英语3)
            
            
                The teachers hold  4   to answer questions that the students have posted.
A. virtual office hours
B. face-to-face meetings
C. regular seminars
                    
                    
                    
                
                
                
            
        A. virtual office hours
B. face-to-face meetings
C. regular seminars
参考答案
 
                