All the books ________ by the students are reported to have been sent to the children in the countryside the other day.
| A．having offered | B．to be offered |
| C．offering | D．offered |
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All the books ________ by the students are reported to have been sent to the children in the countryside the other day.
| A．having offered | B．to be offered |
| C．offering | D．offered |
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