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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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