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 Althoughthecausesofcancer

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問題詳情：

 Althoughthecausesofcancer

 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

【回答】

A

知識點：現在進行時及其被動式

題型：選擇題

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