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    精英家教网 > 高中英语 > 题目详情

    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
    考查被动语态。选项A是现在进行时的被动；选项B是现在完成进行时的主动语态；选项C是现在进行时的主动语态；选项D是现在完成时的主动语态。根据题意：虽然癌症的成因长在被揭示，但我们眼下还没有防止它的实用方法。故答案为A.
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