He asked if Mr.Gilbert's operation had been successful and t

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He asked if Mr.Gilbert's operation had been successful and the doctor told him that it had been.
这是这是原文,我想问最后的that it had been.是什么省略方法,为什么这样用,是什么用法结构,可不可以been后面加上successful.

英语中的省略是一种重要的修辞手法,是为了避免重复而使用的.句子中的某个词,短语,甚至是整个从句都可以省略.当然省略也是有一定规律的.词题属于“表语的省略”,在英语中“与上下文结构相似的表语可以省略”,这句话中包含两个宾语从句,第一句是由if引导的宾语从句,第二句是由that引导的宾语从句,共同构成一个并列句.这就是类似的结构（都属于宾语从句）,为了避免重复,可以省略相同的表语successful,以使句子语言更加简洁、紧凑,表达有力,而且句意清楚,没有产生歧义,这也是英语中省略句的一个重要原则.还有不能够破坏句子的原有结构.最好是不要加successful,因为句意已经很清楚,加上后显得重复累赘.

He asked if Mr.Gilbert's operation had been successful and t please tell me whether my operation had been successful. Uncle Wang asked me where my father had been and what he had While John Gilbert was in hospital ,he asked his doctor to t 完形填空 Mr LI had never been up in an airplanebefore and he had he would have if i had asked 帮忙翻译： He asked me if I had opened it , and I told him "no" . 英语缺词填空Mr.Lee had never been up in an airplane before and he Mr Smith had been to Beijing several times ,and he should ha He asked his doctor to tell him whether his operation had be She asked Simon where he had been.的句子成分 She asked Simon where he had been.划分句子成分