have/has/had/having+been 都是完成时，区别在于： has/have been是现在完成时，has用于第三人称单数; had been过去完成时，跟前者相比，比前者更为过去;having been这种情况应该一般用于句子的非谓语部分或者介词之后吧那么时候要加been 什么时候不加呢？）完成时得时候...
have has had或 having +been 的区别和用法
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