The experiment shows that proper amounts of exercise,if ____
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 为啥不是A?
这里是省略了相同的主句及be动词,整句完整的话应该是: The experiment shows that proper amounts of exercise,if the proper amouts of exercise is carried out regularly,can improve our health. 或者the proper amouts of exercise 可以用it代替. 懂了吗