The experiment shows that proper amounts of exercise, if ___ regularly, can improve our health.
A．being carried outB．carrying outC．to carry outD．carried out
D
本題考查if條件句中的省略情況。本句的句子的主語是theexperiment；謂語動詞是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itis,完整形式是：if it is carried out。句意為：這項實(shí)驗(yàn)表明,適當(dāng)?shù)倪\(yùn)動,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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