问题
选择题
The experiment shows that proper amounts of exercise, if____regularly,can improve our health. [ ]
A. being carried out
B. carrying out
C. carried out
D. to carry out
答案
答案：C
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The experiment shows that proper amounts of exercise, if____regularly,can improve our health. [ ]
A. being carried out
B. carrying out
C. carried out
D. to carry out
答案：C