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He must have finished his project last week,___.

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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
He must have finished his project last week,___.
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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