The experiment show that proper amount o
题型：选择题
问题：
The experiment show that proper amount of exercise, if ________ regularly, can improve our health.
A．carry out
B．carried out
C．to carry out
D．being carried out
The experiment show that proper amount of exercise, if ________ regularly, can improve our health.
A．carry out
B．carried out
C．to carry out
D．being carried out