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?

分类: 作业答案 • 2021-12-19 18:59:33

问题描述：

答

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?
如果您认可我的答案,请点击下面的“选为满意回答”按钮,警察花了两年去寻找他的自行车。怎么表达呢？The police spend two years in finding his bicycle