Theexperimentshowsthatproperamountsofphysicalexercise,...

問題詳情：

 The experiment shows that proper amounts of physical exercise, if _______ regularly, can make a difference to our health.

  A. being carried out        B. carrying out         C. carried out         D. to carry out

【回答】

C

知識點：動詞

題型：選擇題