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求高手解答一个初三英语选择题,麻烦说明下原因.

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求高手解答一个初三英语选择题,麻烦说明下原因.
I don't think he will paa the exam ___?
A:do I
B:don't I
C:will he
D:won't he
答案是选C的,求解释!
当陈述部分是I think 加从句时,疑问句应和从句的人称时态保持一致.
I think chickens can swim,can’t they?
I think Lucy is a good girl,isn’t she?
I didn't think he was happy,was he?
前否定,后面就肯定,反之亦然