反义疑问句选择题请先帮我看几道题目：1 He said Mary had done it,____?A hadn't s

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反义疑问句选择题
请先帮我看几道题目：
1 He said Mary had done it,____?
A hadn't she B hadn't Mary C didn't he D did he
2 It's my son's birthday next week,and i have to do my best for that,____?
A isn't it B is it C haven't I D don't I
这我特搞不清楚,麻烦简要地说明一下理由.

1 c 因为主句的动词是said,所以用didnot he
2 d 陈述部分有have to +v. (had to + v.),疑问部分常用don't +主语（didn't +主语）.
We have to get there at eight tomorrow, don't we?

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