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his average speed had been 301 这里面的been是什么

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his average speed had been 301 这里面的been是什么
我知道是过去完成时 但我就是不知道为什么要加been 我不能当成被动句 又不能译作完成进行时
his average speed had been 301 这里面的been是什么
知道是过去完成时,为什么还要纠结呢?
这个句子还原成原形是：his average speed （be）301,假如是一般现在时,就是
his average speed is 301
那用过去完成时,不就是把be变成had been吗?
用过去完成时,应该有上下文关系的吧
翻译成：当时他的平均速度已经达到了301
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