It’s known to everyone that to smoking ______(permit) in the library.is permitte

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问题 It’s known to everyone that to smoking ______(permit) in the library.

选项

答案 is permitted

解析 被动语态。此处主语从句的主语与谓语是被动关系。根据句意,需用一般现在时的被动语态形式。
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