The experiment shows that proper amounts of exercise ,if _______regularly, can improve our health.
A．being carried out B．carrying outC．carried outD．to carry out
C
本題考查if條件句中的省略情況。本句的句子的主語是the experiment；謂語動(dòng)詞是shows；that引導(dǎo)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(shí)應(yīng)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(xiàng)實(shí)驗(yàn)表明，適當(dāng)?shù)倪\(yùn)動(dòng)，如果有規(guī)律的進(jìn)行，能夠有助于我們的身體健康。
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