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    4．The fire.believed to due to illegal construction on the building’s roof, was brought under control after an hour． A．have occurred B．occur C．have been occurring D．be occurring 【查看更多】

     

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    The fire，believed to      due to illegal construction on the building’s roof, was brought

        under control after an hour．

    A．have occurred             B．occur  

    C．have been occurring       D．be occurring

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