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We are not allowed to touch it.We____touch it.

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We are not allowed to touch it.We____touch it.
a、mustn't b、mustn't to c、haven't to d、don't have to请选择,最好分析一下,
A这道题的意思是我们不被允许碰它.must是情态动词,后面不能加to,所以先排除Bhaven't to 没有这个结构don't have to没有必要做某事,与原题不符mustn't表示禁止