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    7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.  
    A．are being uncoveredB．have been uncovering
    C．are uncoveringD．have uncovered
    A
    分析语境逻辑不难发现，该空表示“现在正在被揭示”，应填现在进行时被动语态动词形式are being uncovered。
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