we are not allowed to touch it,we touch it A mustn't Bmustn't to C haven't tO 选哪个为什么
人气：152 ℃ 时间：2020-04-05 23:06:00
解答
选A ,前半句已表明是不能碰那个东西的了,不选B,是因为must是情态动词,不能接to ,就想can一样作为情态动词,后面不能加to,至于C,haven't to 这种表达方式是错误的,可以说doesn't have to /don't have to ,
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