Although the causes of cancer ____we do not yet have any practical way to prevent it. A．are ..
Althoughthecausesofcancer____wedonotyethaveanypracticalwaytopreventit.A．arebeinguncov...
Although the causes of cancer ____we do not yet have any practical way to prevent it. A．are being uncovered B．have been uncovering C．are uncovering D．have uncovered
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| 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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