如果主句没有明显的时间状语，就用shouldn't +主语。
如果主句有明显的时间状语，就要用hadn't +主语。
如下题所示
They should have informed you of the result of the competition by the time it was eventually given out, _____D______?
A. haven't they B. didn't they C. shouldn't they D. hadn't they.
They should have informed you of the result of the competition, _____C______?
A. haven't they B. didn't they C. shouldn't they D. hadn't they.
英语学习方法
1、英语基础
要想学好高三英语，英语基础是必须学好的，英语基础没有想象中的那么难，不管是单词还是句型、语法。
在高三复习的第一轮复习中，关于复习系会和语言点，一定要注意听，哪怕是一节课掌握几个短语也行，至于课后就自己拿起高中英语书，从单词背起，考英语一定要有词汇基础，否则什么都是白搭。
2、词典不离手
当在学习高三英语的时候，遇到不会的单词就要查，看到相近的单词分不清也得查明白，不要求自己一遍记住，就看一看给自己一个印象，大概一个单词你查五遍的时候就能记住了。
另外，一定要看英文解释！这个是避免完形填空选项中英语翻译发生歧义很有用的方法，希望能够帮助到大家。
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第1个回答 2017-05-26
如果主句没有明显的时间状语，就用shouldn't +主语
如果主句有明显的时间状语，就要用 hadn't +主语
如下题所示
They should have informed you of the result of the competition by the time it was eventually given out, _____D______?
A. haven't they B. didn't they C. shouldn't they D. hadn't they
They should have informed you of the result of the competition, _____C______?
A. haven't they B. didn't they C. shouldn't they D. hadn't they本回答被提问者采纳
如果主句有明显的时间状语，就要用 hadn't +主语
如下题所示
They should have informed you of the result of the competition by the time it was eventually given out, _____D______?
A. haven't they B. didn't they C. shouldn't they D. hadn't they
They should have informed you of the result of the competition, _____C______?
A. haven't they B. didn't they C. shouldn't they D. hadn't they本回答被提问者采纳
第2个回答 2017-05-26
如果有明显的时间状语,用didn't；
如果没有明显的时间状语，用haven't；
如果没有明显的时间状语，用haven't；
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