摘要： By the time the firemen arrived, the fire for half an hour. A. had gone out B. had been out C. had been put ont D. bas been put out 答:B.go out为不及物短语.意为“熄灭 .put out是及物的短语.意为“扑灭 .可用被动语态.但go out和put out均为暂短性动词.
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By the time the firemen arrived, the big fire ___ for nearly half an hour.
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A. had gone out
B. had been put out
C. had put out
D. had been out
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B. had been put out
C. had put out
D. had been out