Theexperimentshowsthatproperamountsofexercise，if__regularly，canimproveourhealth．（　　） --优优班--学霸训练营

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

【考点】过去分词

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难度：难

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