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[D76] The experiment shows that proper amounts of exercise,i

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[D76] 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
翻译并分析
[D76] The experiment shows that proper amounts of exercise,i
实验表明:如果定期进行适量的练习,可以使我们更健康
这里的空为carried out
是一个省略句,原为if it is carried out regularly……可以将it is(主语,系动词)删除,it代表的是exercise……