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?
dyjjj123 1年前 悬赏5滴雨露 已收到1个回答 我来回答 举报

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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

1年前

5
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