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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

 

C

【解析】本句的句子的主語是the experiment；謂語動詞是shows；that引導賓語從句, 賓語從句的主干事：proper amounts of exercise can improve our health, if_____ regularly是插入的條件從句, 從句的主語是proper amounts of exercise, 此時應用it代替前面提到的主語, 條件句的主語與主句的主語一致, 并且含有is, 故省略了it is, 完整形式是：if it is carried out。句意為：這項實驗表明, 適當的運動, 如果有規(guī)律的進行, 能夠有助于我們的身體健康。

 

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