i don't think he could have done better than that,()?A.do i

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i don't think he could have done better than that,()?A.do i B.don't i C.could he D.couldn't he

选C.
句子意思：
我认为他本不能够做得比那更好的,对吧?
关键考点：
①否定转移.think,believe,suppose,guess,等表示主观认识和判断的动词,当主句的主语为第一称时,宾语从句中的否定经常转移到主句中.
②主从复合句反义问句：
主句是第一人称时,反问部分和从句保持一致.
这就是说,本来否定的应该是从句,即he couldn't have done.
当主句的主语不是第一称时,反问部分主句保持一致.如：
They don't think he could have done better than that,【do they】?

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