◎ 题干
To make our city more beautiful, rubbish            into the river.
[     ]
A. needn't be thrown
B. mustn't be thrown
C. can't throw
D. may not throw
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“To make our city more beautiful, rubbish into the river. [ ]A. needn't be thrown B. mustn't be thrown C. can't throw D. may not throw …”主要考查了你对  【情态动词】【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。