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20.The most polluting vehicles        from driving through the city since then.(  )
A.are bannedB.ban
C.have been bannedD.have banned

分析 从那时起,对环境污染最严重的车辆禁止从市区通过.

解答 答案:C 题干中since then表示从过去到现在的时间,是完成时态的时间状语;ban与vehicles之间构成动宾关系,要用被动.故选C.

点评 语态是表达主语和动作的关系,分为主动语态和被动语态.主动语态表示主语和动作构成主谓关系;被动语态表示主语和动作构成动宾关系.从定义中,可以知道被动语态使用的前提是动词必须及物.学习时要注意掌握.

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