（浙江卷8）. 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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（浙江卷8）. 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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