These elements are at the core of an advertising ,and are often referred to as the "creative mix " 这

题目

These elements are at the core of an advertising ,and are often referred to as the "creative mix " 这里These elements are 这后面的表语呢?不是应该有个形容词吗

答案

介词短语
at the core of an advertising 就作表语,这个句子的意思是“这些元素是广告的核心”.
你要弄清一个概念,就是出了形容词可以作表语外,分词、不定式、介词短语、甚至是名词或名词短语都可以作表语.当然从句也可以作表语,叫表语从句