题文
There is no doubt that by recycling textbooks, the cost of books will be __________ greatly.
| A．increased |
| B．gathered |
| C．collected |
| D．reduced |
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There is no doubt that by recycling textbooks, the cost of books will be __________ greatly.
| A．increased |
| B．gathered |
| C．collected |
| D．reduced |
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