【題目】As everyone knows, rubbish everywhere.
A.need be thrown
B.mustn't be thrown
C.can't throw

【答案】B
【解析】句意：眾所周知，垃圾禁止被到處亂扔。need be thrown需要被扔；mustn't be thrown禁止被扔；can't throw不能扔。根據(jù)句意可知，句子的主語rubbish和動詞throw構(gòu)成被動關(guān)系，這句話應(yīng)使用被動語態(tài)，先排除C，并且這里應(yīng)表示否定的意思，不能亂扔垃圾，故選B。

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