These books ______ (keep) in the library for a long time.have been kept从for a lo

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问题 These books ______ (keep) in the library for a long time.

选项

答案 have been kept

解析从for a long time可判断应用完成时，主语books与谓语keep之间是被动关系。此处应填现在完成时的被动形式。

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