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
问题描述：
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
答
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.