With a question tag: Your mother must be looking forward to your return,_______?

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问题 With a question tag:
Your mother must be looking forward to your return,_______?

选项

答案mustn’t she/isn’t she

解析 主语+must be的推测性陈述句有两种附加形式,分别是must not+主语或is not+主语。本句中陈述部分的主语是your mother,为避免重复,应用代词she替代。答案为mustn’t she/isn’t she。
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