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    16．Computers in offices and homes since 1970s． A．have been used B．had been used C．was D．has been used 【查看更多】

     

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    Computers          in offices and homes since 1970s．

    A．have been used    B．had been used      C．was              D．has been used

     

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    Computers          in offices and homes since 1970s．

    A．have been used    B．had been used      C．was              D．has been used

     

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