改反意疑问句：she must have been forty，hasn't she？They must have seen the film，haven't they？My father must have gone to work，hasn't he？参考1：当陈述部分有情态动词must， 且是must+have done结构 表示对过去的情况进行推测（一般句中有明确的过去时间状语），问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”；如果强调动作的完成（一般没有明确的过去时间状语），问句要用“haven't/hasn't+主语”。 She must have read the n...
