Anyone asked him Barlow could have told the investigators some useful details about the robbery.

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问题 Anyone asked him Barlow could have told the investigators some useful details about the robbery.

选项 A、When anyone asked him
B、Had anyone asked him
C、If anyone asked him
D、When anyone had asked him

答案B

解析 题干句子应用虚拟语气,表本来应该发生的事情但是没有发生。主语用的是could have done可知从句对过去事实进行推测,从句结构为if+主语+had done,if可省略,had提前构成倒装,故正确答案为B。
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