So many women take up walking as a regular form of exercise every day, which, of course,is

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

A. of usefulB. greatly use(答案→)C. of benefitD. 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。

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