…and let you know when the book you want has returned. returned 之前加 been

发布时间：2020-08-17 15:13:47

…and let you know when the book you want has returned. returned 之前加 been 

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(答案→)returned 之前加 been 
解析：因从句意上看，此处要用被动语态
以上问题属网友观点，不代表本站立场，仅供参考！