题文
During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
| A．working | B．to work |
| C．to have worked | D．having worked |
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During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
| A．working | B．to work |
| C．to have worked | D．having worked |
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