prep2-63

cyang16

Compared to those who do not, running three days a week saves an average of 14.1 percent on health-care costs each year in the United States.

(A) Compared to those who do not, running three days a week saves
(B) Compared with nonrunners, people who run three days a week save
(C) Compared to not running, those running for three days a week save
(D) When compared with those who do not, people running three days a week save
(E) When compared to nonrunners, running three days a week saves

答案是B，想问下为什么C错，not running 与those running 难道不平行吗？

yhwut

C的比较对象不平行。RUNNING VS THOSE(PEOPLE)