题目内容
【题目】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
【答案】C
【解析】句意:“这项实验表明,适当的运动,如果有规律地进行,能够有助于我们的身体健康。”if引导的条件句的主语与主句的主语一致,并且含有is,故可以一起省略,完整形式是:if exercise is carried out。
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