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    精英家教网 > 高中英语 > 题目详情

    . In September 2008 , China’s key milestone in space travel_____when Zhai Zhigang conducted the first space walk.

    A．reached

    B．was reached

    C．has reached

    D．had been reached

     

    【答案】

    B

    【解析】略

     

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