Greens must have been to Shanghai ,_____they?A.hadn't B.didn't C.can't D.weren't
问题描述：
Greens must have been to Shanghai ,_____they?A.hadn't B.didn't C.can't D.weren't
还有haven‘t they
答
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 do...那weren‘t they 可以用么？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。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。