.---- she first heard of the man referred to as a specialist

C
强调句型。it's 。that。。。
the man referred to。。。=the man who was referred to
前者为过去分词作后置定语,语法功能等于定语从句。
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再问： 能问你一个问题吗 be comparable to/with compare with/to 有什么区别
再答： compare with 可与…相比，可与…匹敌 Books can be compared to friends。 be comparable to/with 可辨析的，比得上的 No one is comparable to her in beauty。 请自己体会一下两者的区别。