The experiment shows that proper amounts of exercise, if      regularly,  can improve our health.   
A．being carried outB．carried out
C．carrying outD．to carry out
B

這題考查if條件句的省略式，如果主從句的主語一樣，可以省略從句中的主語和be動詞。If carried out="if" the experiment is carried out..,句意是：這個實驗表明，適當(dāng)?shù)腻憻�，如果定期實施，對健康是有利的。選B。
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