He rangs almost the best pupils of his grade,it's surprising

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He rangs almost the best pupils of his grade,it's surprising that he should have failed in this exa
句中should怎么理解?

should have done sth,是虚拟语态中的过去时态表示方法.
放在这个句子里的话,过去时,是因为“this exam”已经结束；而用虚拟语态,是结合上下文,他是这一级学生中最好的之一,所以,如果他在这次考试中失败会令人非常惊讶,it 后面的is,是主句的一般现在时了.
希望我的解答够清晰

He rangs almost the best pupils of his grade,it's surprising it's surprising that he should have refused the offer. --Well,it's surprising.The strongest team of our school_____ （1）It is the teacher’s b（） to see that his pupils study thei 翻译he's the best when it comes to thinking on his feet. it's made of the best w________ it's surprising that John came out of the plane alive.yes,on ____YOURSELF!It's the best way of our life.A.enjoy B.be C.he Grade-school pupils have never had __in the history of the U HE is one of the students who do his best. 英语翻译yet,he continued writing almost to the end of his life,h 句子翻译 he had the best (the worst) of it