问题
选择题
However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.
A．it helps
B．helps it
C．it does help
D．does it help
答案
答案：D
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However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.
A．it helps
B．helps it
C．it does help
D．does it help
答案：D