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    20、One thing’s for sure, the fire _____by some cigarette butts.

    A．might cause                                    B．could have caused 

    C．must have been caused                             D．should be caused

    20、C

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    One thing’s for sure, the fire _____by some cigarette butts.

    A．might cause                                    B．could have caused 

    C．must have been caused                             D．should be caused

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