how long had the police taken to find his bicycle?这个句子结构怎么来的?有个had是干嘛的?

来源：学生作业学帮网编辑：学帮网时间：2024/05/16 12:20:31

had …been形式：过去完成时
警察花费了多长时间去寻找他的自行车?
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过去完成时。had + 动词的过去分词形式，表示过去已经完成的动作、事情。

　　had …been形式：过去完成时警察花费了多长时间去寻找他的自行车

过去完成时，had+been+过去分词
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