It is known to everyone that no smoking(permit)______in the library.

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问题 It is known to everyone that no smoking(permit)______in the library.

选项

答案is permitted

解析本题考查的是被动语态。被动语态的基本结构是“be+过去分词”。又根据主谓一致原则，当动名词短语作主语时，谓语动词应用单数形式，所以用is而非are；由it is known that．．．判断出应用一般现在时，因此正确答案应是is permitted。

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大学英语三级A级

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