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You ought to have helped him with his Englis,( 2.We ought to help each other in our work,( 为什么前面用shouldn"t you后面用oughtn"t we?有什么区别么 选项里是shouldn"t 和 oughtn"t都有啊,肯定有区别

题目详情
You ought to have helped him with his Englis,(
2.We ought to help each other in our work,(
为什么前面用shouldn't you后面用oughtn't we?
有什么区别么
选项里是shouldn't 和 oughtn't都有啊,肯定有区别
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答案和解析
第一个是本应该,是对过去的看法,反义疑问句用过去时,是说当时是吗
第二个两个都可以