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    If only we then the disease was curable. A. knew B. could know C. had known D. would have known 【查看更多】

     

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     If only we ____ then the disease was curable.

    A. knew B. could know C. had known D. would have known

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    If only we ____ then the disease was curable.
    [     ]
    A. knew
    B. could know
    C. had known
    D. would have known

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    If only we ____ the disease was curable then.?
    [      ]
    A. knew    
    B. could know    ?
    C. had known    
    D. would have known

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