作业帮Greens must have been to Shanghai ,_____they?A.hadn't B.didn
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Greens must have been to Shanghai ,_____they?A.hadn't B.didn't C.can't D.weren't
还有haven‘t they
还有haven‘t they
同学,很高兴回答你的问题
正确答案：haven't they
即：The Greens must have been to Shanghai,haven't they?
翻译：格林一家人原来一定去过上海,不是吗?
解析：当must用来表示对过去的情况进行“推测”（must + have done）时,如强调对过去情况的推测（一般句中有过去的时间状语）,反意疑问句部分要用“didn’t + 主语”；如果强调动作的完成（一般没有过去时间状语）,反意疑问句部分要用“haven’t / hasn’t + 主语”.
例：She must have read the novel last week,didn’t she?
她上星期一定读了这本小说了,是吗?
You must have told her about it,haven’t you?
你一定把这事告诉她了,是吗?
你的这道题符合：如强调对过去情况的推测（一般句中有过去的时间状语）,反意疑问句部分要用“didn’t + 主语”；这个规则,所以后面填haven't thy
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不明白请继续追问,
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再问： 那weren‘t they 可以用么？
再答： 不可以，因为前面的陈述句中没有were，所以后面的疑问部分不能weren't 提问。
再问： 为什么额，这是12年安徽江南十笑一个题，当时只有abcd四个选项，答案给的是d，我一直弄不明白
再答： 哦，我才仔细看了一下，D选项是weren't，这就是说强调对过去事情的推测，反意疑问句部分要用“didn’t + 主语”或“wasn't/weren't + 主语”，本句虽然没有明显的过去时间状语，但是也是表示对过去的推测。
正确答案：haven't they
即：The Greens must have been to Shanghai,haven't they?
翻译：格林一家人原来一定去过上海,不是吗?
解析：当must用来表示对过去的情况进行“推测”（must + have done）时,如强调对过去情况的推测（一般句中有过去的时间状语）,反意疑问句部分要用“didn’t + 主语”；如果强调动作的完成（一般没有过去时间状语）,反意疑问句部分要用“haven’t / hasn’t + 主语”.
例：She must have read the novel last week,didn’t she?
她上星期一定读了这本小说了,是吗?
You must have told her about it,haven’t you?
你一定把这事告诉她了,是吗?
你的这道题符合：如强调对过去情况的推测（一般句中有过去的时间状语）,反意疑问句部分要用“didn’t + 主语”；这个规则,所以后面填haven't thy
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
不明白请继续追问,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
再问： 那weren‘t they 可以用么？
再答： 不可以，因为前面的陈述句中没有were，所以后面的疑问部分不能weren't 提问。
再问： 为什么额，这是12年安徽江南十笑一个题，当时只有abcd四个选项，答案给的是d，我一直弄不明白
再答： 哦，我才仔细看了一下，D选项是weren't，这就是说强调对过去事情的推测，反意疑问句部分要用“didn’t + 主语”或“wasn't/weren't + 主语”，本句虽然没有明显的过去时间状语，但是也是表示对过去的推测。
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