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