The operation John had was not successful.为什么用had呢,

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• The operation John had was not successful.为什么用had呢,整句意思不是John的手术没有成功吗,为什么用had呢,我知道是定语从句，可是为什么还有was
• The operation John had was not successful.请问The operation John had是倒装吗
• The operation John had was not successful.请问The operation John had是倒装吗
• The operation John had was not successful.为什么用had呢,
• A young man and a young woman were sitting behind me.They were talking loudly.为什么用过去进行时?Last week I went to the theatre.I had a very good seat.The play was very interesting.I did not enjoy it.A young man and a young woman were sitting behind me.They were talking loudly.这段英文为新概念英语第2册开篇部分.A young man and a young woman were sitting behind me.They were talking loudly.这两句为什么要用过去进行时态呢?是作者想表达一对男女一直坐在他后面,一直持续不停的讲话的意思吗?
• 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.
• 关于行星的运动，下列说法中正确的是（　　） A.关于行星的运动，早期有“地心说”与“日心说”之争，而“地心说”容易被人们所接受的原因之一是由于相对运动使得人们观察到太阳东
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