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

C

分析題干結(jié)構(gòu)可知，if從句中缺少主語(yǔ)，所以應(yīng)該用動(dòng)詞的非謂語(yǔ)形式。另外，根據(jù)題意可知，定期適量的體育運(yùn)動(dòng)會(huì)改善我們的身體狀況，if從句中的邏輯主語(yǔ)中心詞“exercise”和動(dòng)詞短語(yǔ)“carry out” 開展，執(zhí)行，履行 之間為被動(dòng)關(guān)系，句子補(bǔ)充完整應(yīng)為“if the exercise is carried out...”，所以應(yīng)該用過去分詞形式，而A項(xiàng)表示動(dòng)作正在進(jìn)行不合題意。故答案為C項(xiàng)。

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