They must have stayed at hotel last night,____?A.mustn钬檛 they听听听 B.

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They must have stayed at hotel last night,____?A.mustn钬檛 they听听听 B.
They must have stayed at hotel last night,____?A.mustn钬檛 they听听听 B.

They must have stayed at hotel last night,____?A.mustn钬檛 they听听听 B.
你的选项有乱码.
应填didn't they.
must have done 这样的句型表示的是对过去事情的猜测.表过去的助动词是did,因反义疑问句前半句是肯定的,后面用否定形式,主语是they,即didn't they.
翻译:他们昨晚一定是呆在宾馆里,对吗?

答案为Didn't they?因为出现了last night 这一时间状语,若无则为Haven' t they?