答案应该是C：这道题考的反义疑问句.A mustn't 是“不准”的意思,可直接排除的哈； B 如果原句有一个表过去的时间状语,那么反义疑问句部分就该与时间状语保持一致,比如说He must have finished his homework yesterday,此时就该用didn't he?而这题没有,B答案就可去掉了； 而答案 C是正确的,是因为原句不存在时间状语,则根据原句的谓语动词做相应的变化,原句是完成时,且是对过去的肯定推测,则直接把助动词have变为haven't,又因为主谓一致的关系,把haven't 变为hasn't······
He must have finished his homework,he A,mustn't B didn't Cha
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