Theexperimentshowsthatproperamountsofexercise，if 

問題詳情：

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

【回答】

C

知識點：非謂語動詞

題型：選擇題