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

試題分析：句意：這項實驗表明適量的運動，如果有規(guī)律的完成，可以改善你的健康。這里是省略了相同的主語及be動詞，整句完整的話應(yīng)該是：The experiment shows that proper amounts of exercise, if the proper amouts of exercise is carried out regularly, can improve our health.選B。
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