The experiment shows that proper amounts of exercise, if regularly, can improve our healt

发布时间:2020-08-16 14:46:19

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

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A. being carried out
B. carrying out
(答案→)C. carried out
D. to carry out
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