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几道高一英语1.I don't think he had his supper at the school,----?A

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几道高一英语
1.I don't think he had his supper at the school,----?
A.had he B.did he C.do I D.don't you为什么不是A?
2.I'm sure he must have been sleeping at the moment,----?
A.aren't I B mustn't C.wasn't he D.hasn't he
1 B 主句里出现 i think 之类的,反义疑问句就必须看从句行事,记住就好.我们看到从句中谓语是had,又加上是否定 i don't think 所以反义疑问句中就是 肯定的did he
2 C I'm sure和 I think 一个道理.must have done 一看就是对过去的一种猜测,其实质就是过去时态.句中不过使用过去进行时,还原过来就是 I'm sure he was sleeping at the moment,wasn't he?