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【题目】The experiment shows that proper amounts of physical exercise, if _______ regularly, can make a difference to our health.

A. being carried out B. carrying out

C. carried out D. to carry out

【答案】C

【解析】试题分析:考查状语从句的省略。。当状语从句的主语与主句的主语一致,且状语从句中有系动词be的时候,可以把状语从句的主语和be动词一起省略。本句在if后面省略了proper amounts of exercise is;句意:这个实验显示,如果适当数量的锻炼被经常进行,这样的锻炼能够改善我们的健康状态。故C正确。

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