[-B53] The experiment shows that proper amounts of exercise,if ______ regularly,can improve ourhealth.A.being carried out B.carrying out C.carried out D.to carry out 翻译并分析

[-B53] The experiment shows that proper amounts of exercise,if ______ regularly,can improve ourhealth.A.being carried out B.carrying out C.carried out D.to carry out 翻译并分析
[-B53] 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
翻译并分析

[-B53] The experiment shows that proper amounts of exercise,if ______ regularly,can improve ourhealth.A.being carried out B.carrying out C.carried out D.to carry out 翻译并分析
C 这里是省略了相同的主句及be动词,整句完整的话应该是：
The experiment shows that proper amounts of exercise,if the proper amouts of exercise is carried out regularly,can improve our health.
或者the proper amouts of exercise 可以用it代替.