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The experiment show that proper amount of exercise, if ________ regularly, can improve our health.
A.carry outB.carried outC.to carry outD.being carried out
B
考查分词做状语。proper amount of exercise与carry out构成被动关系。Carried out regularly在句中做条件状语。句意:实验显示,如果经常进行,适当数量的锻炼可以改善我们的健康。
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