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

試題分析：句意：廢紙是禁止被扔掉的。我們應該保持環(huán)境衛(wèi)生。分析：考查被動語態(tài)的用法，被動語態(tài)的構成: be + done（動詞的過去分詞）。分析：禁止被扔掉，體現(xiàn)情態(tài)動詞的被動詞態(tài)。構成為must be +done (動詞的過去分詞).同時考查固定短語：throw away扔掉。故選C
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