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                题目内容
                (郑州航空工业管理学院-大学英语)
            
            
                They had talked only for a few minutes ________ they found they were of different opinions. 
(4.0分)
4.0 分
A、
while
B、
before
C、
once
D、
unless
                    
                    
                    
                
                
                
            
        (4.0分)
4.0 分
A、
while
B、
before
C、
once
D、
unless
参考答案