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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 uncovered

C．are uncovering

D．have uncovered

试题答案

答案：A

标签：dowenothaveyet

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