Studies show that young people with higher-than-average blood pressure and their families have a history of high blood pressure are more likely than others to develop a severe form of the condition.
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Aand their families have a history of high blood pressure
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Bwhose families have a history of high blood pressure
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Cand a history of high blood pressure runs in the family
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Dwhose families have a history of high blood pressure running in them
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Ewith a history of high blood pressure running in their family
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正确答案: B