这句子中的that是什么意思,I am sure that this English book will be of great help to you

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这句子中的that是什么意思,I am sure that this English book will be of great help to you

这里做连接副词
引导后面的宾语从句,本身无意义.

用来引导从句的,没什么意思,在这里是可以省略的。

(used to introduce a clause that is the subject or object of a v 用以引导主语从句或宾语从句):

be sure that是固定搭配,此处that无实际意义,引出从句,也可省略。