题文
Some ______are ______their time to help the poor in underdeveloped countries.
| A．volunteer;volunteer | B．volunteers;volunteering |
| C．volunteering;volunteers | D．volunteers;volunteers |
Some ______are ______their time to help the poor in underdeveloped countries.
| A．volunteer;volunteer | B．volunteers;volunteering |
| C．volunteering;volunteers | D．volunteers;volunteers |
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