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During the tourist season, there are many people wandering in this city to

see the old castles _____ in the sixteenth century.

  A. to be built  B. being built

  C. having been built       D. built   

During the tourist season, there are many people wandering in this city to see the old castles_____ in the sixteenth century.

   A. to be built    B. being built

   C. having been built        D. built    

During the tourist season, there are many people wandering in this city to see the old castles_____ in the sixteenth century.

   A. to be built    B. being built

   C. having been built        D. built    

During the tourist season, there are many people wandering in this city to see the old

castles _____ in the sixteenth century.

A. to be built   B. being built   C. having been built        D. built

During the tourist season, there are many people wandering in this city to see the old

castles _____ in the sixteenth century.