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By the time the fire-engine arrived, the fire        by the inhabitants.   
A.put outB.had been put out
C.was put out D.had put out
B
本题考查时态和语态。句意:当救火车到达的时候,火被居民们扑灭了。由句意可知应用被动语态;且动作在arrived之前发生,要用过去完成时。
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