To make our school more beatiful,rubbish ( ) into the rive.A.can't throw B.mustn't be thrown C.needn't be thrown

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To make our school more beatiful,rubbish ( ) into the rive.A.can't throw B.mustn't be thrown C.needn't be thrown

To make our school more beatiful,rubbish ( ) into the rive.A.can't throw B.mustn't be thrown C.needn't be thrown
To make our school more beatiful,rubbish ( ) into the rive.
A.can't throw B.mustn't be thrown C.needn't be thrown

To make our school more beatiful,rubbish ( ) into the rive.A.can't throw B.mustn't be thrown C.needn't be thrown
垃圾是被扔的 所以要用被动语态 所以排除A 根据句义分析这里应该是“必须不能” 而C是“不需要的意思” 所以不对

mustn't do 表示严禁，禁止
整句意为：为了让我们的学校更美丽，垃圾严禁被扔到河里。
望采纳~

mustn`t 表示禁止

mustn't 表示禁止，最符合此处的语境
为了让我们的校园更美丽，垃圾被禁止扔到河里。

首先要确定用被动语态，因此A不能选，其次，mustn't是禁止的意思，而needn't则是不需要的意思，不符合语境，因此选B。（明白吗？）

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