Mary must have gone to the cinema when I went to see her yesterday,__?A.didn't sheB.mustn't shewhy we choose A

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Mary must have gone to the cinema when I went to see her yesterday,__?A.didn't sheB.mustn't shewhy we choose A
Mary must have gone to the cinema when I went to see her yesterday,__?
A.didn't she
B.mustn't she
why we choose A

Mary must have gone to the cinema when I went to see her yesterday,__?A.didn't sheB.mustn't shewhy we choose A
must have gone 这里的 must + 完成时态 ,表示 猜测
还原:
Mary went to the cinema when I went to see her yesterday,didn't she?
肯定:must have done
否定:cant have done
可能:may have done
以上是对过去时的猜测
现在时的猜的
肯定 must be
否定 cant be
可能 may be

must 做情态动词时只用在肯定句,不能用在否定和疑问句中。
所以,这里的反义疑问句只能借助于助动词did。

must have done表示对过去的猜测

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