The old professor told us that every part of the materials should be made use of __________ the station.
| A．building |
| B．to build |
| C．build |
| D．being build |
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The old professor told us that every part of the materials should be made use of __________ the station.
| A．building |
| B．to build |
| C．build |
| D．being build |
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