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2.Dogs are not permittedin the building.

分析 狗不允许在大楼里.

解答 petmitted 考查被动语态.根据句意:狗不允许在大楼里.permit是动词"允许,许可",因为句子的主语是dogs,所以用被动语态,故答案填permitted.

点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.

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