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问题: I think he was ill in hospital,for he didn't come to school,______?反意疑问句怎么作

解答:

did he
因为think的内容是他没来学校的推断,也就是for后面的内容
由于主语是I,所以否定的是内容而不是think,要用did he

(讲得好象有点不太清楚.我提供的资料里有个反意疑问句的几个重点,你可以去看看,里面应该讲得比较清楚,不用积分~~)