◎ 题干
By the time the firemen arrived, the big fire ___ for nearly half an hour.
 [     ]
A. had gone out  
B. had been put out  
C. had put out
D. had been out
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“By the time the firemen arrived, the big fire ___ for nearly half an hour. [ ]A. had gone outB. had been put outC. had put outD. had been out…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。