Campbell was disappointed to learn that his average speed had been 299 miles per hour.句子成分

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Campbell was disappointed to learn that his average speed had been 299 miles per hour.句子成分

Campbell 主语
was disappointed 系动词+表语.
to learn 不定式做状语.下面是learn 的宾语从句
that his average speed 宾语从句的主要
had been 系动词
299 miles per hour.表语