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Your sister must be helping the little girl with her homework, _______ ?
A.needn’t sheB.mustn’t sheC.isn’t she D.must she
C

试题分析:句意为:你的姐姐一定是正在帮助那个小女孩儿做功课,不是吗?句中的must不是必须的意思,而是表示对现在正在发生的事情的肯定推测,表示推测的句子的反意疑问句变化时应还原成不推测的句子,所以这个句子应还原成:Your sister is helping the little girl with her homework,______? 故应填isn’t she.答案为C。
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