She said to me that This old airport built ten years ago ___.
                    举一反三
- The airport was built years ago, for some reason, it could not be used then.
 - She moved to England ten years ago to pursue her love for architecture.
 - We each other since known; ten years ago. A: have known; ten years ago B: knew; ten years ago C: have known; ten years D: knew; ten years
 - ten years old are
 - Is this the factory ______ he worked ten years ago?
 
