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 built

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 built

The old professor told us that every part of the materials should be made use of ________ the station．

1. A.
   building
2. B.
   to build
3. C.
   build
4. D.
   being built