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 |
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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 |
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