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has been ,had been,have been的区别,以及使用方法是什么

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has been ,had been,have been的区别,以及使用方法是什么
has been ,have been 首先来看这两个词组的时态都是现在完成时,第一个词组适用于第三人称单数之后,第二个用于非第三人称之后,后面加上to的意思是曾经去过某地,现在已经返回之意.had been是前面两个词组的过去完成时形式,常常用于宾语从句之中,比如：Tom has been to USA twice.we have been to Beijing many times.He said that he had been to many places of interest this year.欢迎提问,竭诚为您服务!
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