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
