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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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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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

by the time ,by then By the time by the time in the free time与on the free time的区别急 Taecher should allow students have enough free time（改为被动语态） The work can be finished by leo 用by the time造句! by the time怎么造句? by the time +现在式造句 by the time 的用法 by the time 等于什么? by the time to 谢 by the time什么意思 The Free free the free the the time,show by the day on the time ,in the time ,at the time ,by the time on the time ,in the time ,at the time ,by the time