新概念2册,L72：Afterhisattempt,Campbellwasdisappointedtolearnthathisaveragespeedhadbeen299milesperhour.299前面为什么是hadbeen?用was不行吗?作者想表达什么呢?

Question

新概念2册,L72：After his attempt,Campbell was disappointed to learn that his average speed had been 299 miles per hour.
299前面为什么是had been?用was不行吗?作者想表达什么呢?

Answer 1

这句话的意思：努力之后,Campbell失望的得知他的平均速度是每小时299英里.
had been是过去完成时,这句话的谓语动词是was,用了过去式,要先知道速度是多少才感到失望,动作有先后之分,且前面有个表示时间先后的词after（在...之后）,was用了过去式,后面的是过去的过去,用过去完成时