题目内容

(2012·昆明高二检测)It is well-known that proper amounts of exercises, if _______ regularly, will benefit our health.
A．being carried outB．carrying out
C．carried outD．to carry out
C
C 句意：据说如果有规律地进行适量的运动，对健康有益。carry out是及物动词短语，与proper amounts of exercises之间是动宾关系，if条件句里省略了主语proper amounts of exercises，因此用过去分词表示被动。
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