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
人气：318 ℃ 时间：2020-02-06 09:41:28
解答
ifcarried 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.
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