The experiment shows that proper amounts of exercise, if __ regularly, can imp
题型：不详难度：来源：
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 |
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答案
| C |
解析
| ：本题考查if条件句中的省略情况。本句的句子的主语是the experiment；谓语动词是shows；that引导宾语从句，宾语从句的主干事：proper amounts of exercise can improve our health，if_____ regularly是插入的条件从句，从句的主语是proper amounts of exercise，此时应用it代替前面提到的主语，条件句的主语与主句的主语一致，并且含有is，故省略了it is，完整形式是：if it is carried out。句意为：这项实验表明，适当的运动，如果有规律的进行，能够有助于我们的身体健康。 |
举一反三
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This is the material ________ in the laboratory tomorrow morning.| A．tested | B．to be tested | C．being tested | D．will be tested |
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____________ the Roman numerals, the Arabic numbers are rather simple to use. | A．Compared with | B．Comparing with | C．Compared as | D．Comparing as |
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.________ the report, I handed it to John, but he said that George was the person to send it to. | A．Being finished | B．Having finished | C．Finishing | D．To have finished |
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