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Although the causes of cancer , we do not yet have any practical way to prevent

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Although the causes of cancer , we do not yet have any practical way to prevent

 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

试题答案

A

标签：dowenothaveyet

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