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During the past years, intelligent technology has evolved (116) three generations. The first was ...

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becomes   became   has become   had become  
becomes    became    has become    had become Key: C  
permanent  powerful  striking  practical  
the past 30 million  the past 40 million  the past 50 million  the past 10 million  
How  What  How a  What a  
witnessed  witnesses   has witnessed  will witness  
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becomes    became    has become    had become
  
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