by the time the freemen arrived at the building,the fire ———by the nearby citizens.(put)消防员到达这栋大楼的时候,附近的市民已经把火扑灭了

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bythetimethefreemenarrivedatthebuilding,thefire———bythenearbycitizens.(put)消防员到达这栋大楼的时候,附近的市民已经把火扑灭了

by the time the freemen arrived at the building,the fire ———by the nearby citizens.(put)消防员到达这栋大楼的时候,附近的市民已经把火扑灭了
by the time the freemen arrived at the building,the fire ———by the nearby citizens.(put)
消防员到达这栋大楼的时候,附近的市民已经把火扑灭了

by the time the freemen arrived at the building,the fire ———by the nearby citizens.(put)消防员到达这栋大楼的时候,附近的市民已经把火扑灭了
填:had been put out
由主句的by the time和arrived可知,动作发生在过去的过去,用过去完成时
put out扑灭

填写had been put out.这是过去完成时,同时得用被动。
当消防员赶到现场时候,大火已经被附近的居民扑灭了。

答案: had been put out
用过去完成时的被动语态
其结构: had been + 过去分词
put out 扑灭