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                题目内容
                (广东开放大学-大学英语2)
            
            
                The firemen have been examining the ground 回答
D
yesterday.
A.for
B.since
C.ago
D.by
                    
                    
                    
                
                
                
            
        D
yesterday.
A.for
B.since
C.ago
D.by
参考答案