rere objects are beautifully displayed in glass case to keep them free from中的 case to如何解释

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• Rare objects are beautifully displayed in glass cases____them free from dust.A.which are keeping,B.which keep . C.who keep D. and kept.这句话中为什么选B,不选D,为什么只能用定语从句,不能用并列句,区别是什么,它们在一个句子里,谢谢
• rere objects are beautifully displayed in glass case to keep them free from中的 case to如何解释
• rere objects are beautifully displayed in glass case to keep them free from中的 case to如何解释
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