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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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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科目：高中英語 來源： 題型：

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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科目：高中英語 來源： 題型：

 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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科目：高中英語 來源： 題型：

 Although the causes of cancer_____, we do not yet have any practical way to prevent it.
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科目：高中英語 來源：2013屆河北省保定市唐縣一中高三下學(xué)期第二次摸底考試英語試卷（帶解析） 題型：單選題

Although the causes of cancer_____, we do not yet have any practical way to prevent it.

A．a(chǎn)re being uncoveredB．have been uncovering
C．a(chǎn)re uncoveringD．have uncovered

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Although the causes of cancer_____, we do not yet have any practical way to prevent it.

A．a(chǎn)re being uncovered                    B．have been uncovering

C．a(chǎn)re uncovering                         D．have uncovered

 

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Although the causes of cancer_____, we do not yet have any practical way to prevent it.

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C．a(chǎn)re uncovering                         D．have uncovered

 

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

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 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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