It's an English story of few new words,--?后面该填什么呢?

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isn't it?
这是反义疑问句.句子前面It's 是肯定的,所以反义疑问句要用否定的isn't it.
要注意I think 的反义疑问句是要根据从句的.而从句中的否定通常前置.
======以下答案可供参考======
供参考答案1:
isn't it
供参考答案2:
反义疑问句(The Disjunctive Question)
即附加疑问句。它表示提问人的看法,没有把握,需要对方证实。
反义疑问句由两部分组成：前一部分是一个陈述句，后一部分是一个简短的疑问句，两部分的人称时态应保持一致。
1．陈述部分肯定式+疑问部分否定式
2．陈述部分否定式+疑问部分肯定式
They work hard, don’t they?
She was ill yesterday, wasn’t she?
You didn’t go, did you?
He can’t ride a bike, can he?
He is a student,isn't he?
[编辑本段]特殊的句型
请注意以下句型的反义疑问句的用法：
1．当陈述部分的主语是I , everyone, everything, nobody 时，后面的疑问句应表示为：
I am a student, aren’t I ?
Everyone is in the classroom, aren’t they? (基本不用单数）
Nobody will go, will they?
2. 否定 （1）当陈述部分有never，seldom, hardly，few，little，barely, scarcely, nothing 等否定词时，后面的疑问句则为肯定形式：
There are few apples in the basket, are there?
He can hardly swim, can he?
They seldom e late, do they?
（2）当陈述部分含有否定意思的词是unhappy,dislike,unfriendly等含有否定词缀的派生词时，疑问部分要用否定形式。如：
He looks unhappy,doesn't he?他看上去不高兴，不是吗？
The girl dislikes history,doesn't she?这女孩不喜欢历史，不是吗？
3.think, believe, suppose, imagine, expect等动词后接宾语从句构成的主从复合句在构成反意疑问句时，视情况不同有两种不同的构成方式。
(1.)当主句的主语为第一人称时，其后的简短问句应与从句相一致。例如：
I expect our English teacher will be back this weekend, won't she/he? We suppose you have finished the project, haven't you? 值得注意的是，当这些动词后接的宾语从句的否定转移到主句时，其仍属否定句，故其后的简短问句应用肯定式，而非否定式。例如： I don't believe that he can translate this book, can he? We don't imagine the twins have arrived, have they? 此类句子的回答同前否后肯型反意疑问句一样，如上述后一个句子，若双胞胎已经到了，则回答为Yes, they have.；若尚未到达，使用No, they haven't.。 (2).当主句的主语为第二、三人称时，其后的简短问句则应与主句相一致（此时，否定只看主句，与从句无关...）。例如： Your sister supposes she needs no help, doesn't she? You thought they could have pleted the project, didn't you? They don't believe she's an engineer, do they? She doesn't expect that we are ing so soon, does she?