题目内容

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

这题考查if条件句的省略式，如果主从句的主语一样，可以省略从句中的主语和be动词。If carried out="if" the experiment is carried out..,句意是：这个实验表明，适当的锻炼，如果定期实施，对健康是有利的。选B。
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