It has been said that everyone lives by seeling something.这句话中为什么不用一般现在时it has been said 这部分

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It has been said that everyone lives by seeling something.这句话中为什么不用一般现在时
it has been said 这部分

have/has been + 动词过去分词,表示某事已经被做了,某物已经被怎么样有一段时间了.