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Waste paper mustn’t _______. We should keep our environment clean.
A.throw awayB.thrown away
C.be thrown awayD.been thrown away
C

试题分析:句意:废纸是禁止被扔掉的。我们应该保持环境卫生。分析:考查被动语态的用法,被动语态的构成: be + done(动词的过去分词)。分析:禁止被扔掉,体现情态动词的被动词态。构成为must be +done (动词的过去分词).同时考查固定短语:throw away扔掉。故选C
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