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    The officials concluded from a analysis of the traffic accident that by human error. A. they were caused B. it was caused C. it had been caused D. they had caused 【查看更多】

     

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    The officials concluded from a analysis of the traffic accident that ________ by human error．


    1. A.
      they were caused
    2. B.
      it was caused
    3. C.
      it had been caused
    4. D.
      they had caused

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    The officials concluded from a analysis of the traffic accident that ________ by human error．

    [　　]

    A．they were caused

    B．it was caused

    C．it had been caused

    D．they had caused

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