Question

The professor suggested the problem ________ at once.

A. referred to be solved    B. referred to solving

C. referred to was solved    D. referred to must be solved

Answer

A

【解析】

考查过去分词和suggest的用法。句意：教授建议所提到的那个问题应该马上予以解决。the problem 和referred to 之间是被动关系，此处是过去分词做后置定语，相当于定语从句which had been referred to；suugest “建议” 接句子时用虚拟语气（should)+动词原形，其中should可以省略，再根据the problem 和solve之间是被动关系，所以要用被动语态（should ）be solved。故选A。