一道高考非谓语的选择题The experiment shows that proper amounts of exerc

一道高考非谓语的选择题
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
选C不选A的具体解释
spirit娃娃 1年前 已收到1个回答 举报
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露珠里的光 幼苗

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if carried out regularly,can improve our health.
=it can improve our health,if it is carried out regularly,
主从句主语it所指相同,可省略.本句为被动句,故carry为过去式.

1年前

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