So many women take up walking as a regular form of exercise every day, which, of course,is to their health.
A. of useful
B. greatly use
C. of benefit
D. greatly benefit
网友回答
A. of useful
B. greatly use
(答案→)C. of benefit
D. greatly benefit
解析：句意：有那么多的妇女把走路看成是一种锻炼的常见的形式，这当然对他们的健康是非常有益的。of+ 形容词=名词，所以选项A不对；选项BD缺少of；故选C。