题文
The experiment shows that proper amounts of exercise, ifregularly, 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, ifregularly, can improve our health.
| A． | being carried out | B． | carrying out | C． | carried out | D． | to carry out |
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