By the time that the guards in the building realized what was happening, the fire ______.

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问题 By the time that the guards in the building realized what was happening, the fire ______.

选项 A、had already been put out
B、was put out
C、would have been put out
D、had put out

答案A

解析本题测试的是动词时态的用法。全句的意思是：“等保安明白过来发生什么事时，大火已被扑灭了。”当“by the time that．．．”引导的句子的谓语动词是一般过去时时，根据时态一致原则，主句的谓语动词常用过去完成时表示过去的过去。根据句意，应选答案A。

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大学英语三级A级

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