15. 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
(责任编辑:admin) |
15. 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
(责任编辑:admin) |