T-9-Q39. 987-675 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.
A. and their families have a history of high blood pressure
B. whose families have a history of high blood pressure
C. and a history of high blood pressure runs in the family
D. whose families have a history of high blood pressure running in them
E. with a history of high blood pressure running in their family whose不是直接跟在前面的先行词后面做宽展意义吗? 这里为什么就可以这么用???