However busy we are we need to take exercise. Not onlyus keep healthy it also stops us g

问题补充：

However busy we are, we need to take exercise. Not onlyus keep healthy, it also stops us getting fat.

A. it helps

B. helps it

C. it does help

D. does it help

答案：

A. it helps

B. helps it

C. it does help

(答案→)D. does it help

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