Aunt Mary is crazy about shopping. She must be snapping up the bargains in the department store during such a sale, ?A.mustn’t she?B.isn’t sheC.needn’t sheD.doesn’t she
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B解析当must用来表示对现在的情况进行推测时，问句通常要根据must后面的动词采用相应的形式。Must后的动词时be，主语she是单数第三人称，故选B。