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(yīng)該保持環(huán)境衛(wèi)生。分析：考查被動(dòng)語(yǔ)態(tài)的用法，被動(dòng)語(yǔ)態(tài)的構(gòu)成: be + done（動(dòng)詞的過(guò)去分詞）。分析：禁止被扔掉，體現(xiàn)情態(tài)動(dòng)詞的被動(dòng)詞態(tài)。構(gòu)成為must be +done (動(dòng)詞的過(guò)去分詞).同時(shí)考查固定短語(yǔ)：throw away扔掉。故選C
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