Althoughthecausesofcancer,wedo

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

A．have uncovered	B．have been uncovering
C．are uncovering	D．are being uncovered

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A．delivers

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_____ your advice, I would have had no trouble with my papers.

A．Had I followed

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A．Given

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A．understood	B．understand
C．to understand	D．being understood

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A．including

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