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
本題考查時態(tài)和語態(tài)。句意：當(dāng)救火車到達(dá)的時候，火被居民們撲滅了。由句意可知應(yīng)用被動語態(tài)；且動作在arrived之前發(fā)生，要用過去完成時。
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