He must have finished his project last week,___.

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/05/15 12:59:18

He must have finished his project last week,___.
A.mustn't he B.didn't he C.hadn't he……答案是B为什么?AC不可以吗?求详解
sorry,C搞错了，是haven't he

对已发生的过去情况的推测,若陈述句谓语部分有“must have done”,而且有表示过去的时间状语,问句部分用didn't；若没有表示过去的时间状语,问句部分用haven't或hasn't.如：
1)They must have gone there last night,didn't they?
2)They must have arrived by now,haven't they?（根据by now来判断）
3)They must have been to the Great Wall,haven't they?
再问：那还有没有像must have done 一样的固定搭配呢？？？(我会提高悬赏的）please
再答：详情请参照链接http://zhidao.baidu.com/link?url=M38KWkripFvu7xBCFZ764S21TYr2N3ZQ2-WpOPmCeb7nYdT8YbFz8WszkeEvrW9AvzDucMq_tCowD0Q4pGO7NK
这是我在网上给你搜出来的一番解释，希望对你有用！

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