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    - should I clean out the refrigerator? -Twice a week. A.How often B.How soon C.How for D.How much 【查看更多】

     

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    —____should I clean out the refrigerator?    
    —Twice a week.    
    [     ]
    A．How often    
    B．How soon    
    C．How far    
    D．How much

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