---Dad,___I build a dog house in my bedroom? ---No,you___.You must keep your room clean.A.may,mustn't B.can,needn't选哪个,请说明理由

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---Dad,___I build a dog house in my bedroom? ---No,you___.You must keep your room clean.A.may,mustn't B.can,needn't选哪个,请说明理由
---Dad,___I build a dog house in my bedroom? ---No,you___.You must keep your room clean.
A.may,mustn't B.can,needn't
选哪个,请说明理由

---Dad,___I build a dog house in my bedroom? ---No,you___.You must keep your room clean.A.may,mustn't B.can,needn't选哪个,请说明理由
A
句意是:爸爸,我可以在我的卧室里搭个狗窝吗?
不,你不能这么做.你必须保持房间干净.
用May 提问,表示请求许可.用mustn't 回答,表示强烈的反对,有“不应该,千万不能”之意.needn't 表示不需要,语气与句意不符.

A 第二个空应该是不允许(不能)而不是needn't不需要 may和can都能表示请求