题目内容

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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