these books ________ in the libraray for a long timea.A have kept B have been kept

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these books ________ in the libraray for a long timea.A have kept B have been kept

选择B,因为这些书是被保存在图书馆的,是个被动语态
翻译:这些书已经被保存在图书馆好长时间了!
希望我的回答能够帮到你,

B have been kept

B