33．The computers made by our company sell best, but several year's ago no one could have imagined the role in the markets that they . A．were playing B．were to play C．have played D．played 【
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The computers made by our company sell best， but several year's ago no one could have imagined the role in the markets that they ________．
- A.
were playing
- B.
were to play
- C.
have played
- D.
played
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