—Haven't you realized the use________the used paper?
—Yes, already.
| A．we make of |
| B．which we make |
| C．for our making |
| D．for us to make |
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—Haven't you realized the use________the used paper?
—Yes, already.
| A．we make of |
| B．which we make |
| C．for our making |
| D．for us to make |
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