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                题目内容
                (国家开放大学英语语法)
            
            
                Since the premium varies with the scope of (  ), extra premium is for buyers’ account, should additional risks be covered.
A. assurance
B. insurance
C. business
D. enterprises
                    
                    
                    
                
                
                
            
        A. assurance
B. insurance
C. business
D. enterprises
参考答案