问题
选择题
(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 out
B．carrying out
C．carried out
D．to carry out
答案
答案：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。