题目内容

【题目】 Not all the patents________ have been recognized.

A. to be examined B. being examined

C. examined D. having been examined

【答案】C

【解析】

试题分析:句意:并不是所有被检验的专利都被认可。句中已有谓语动词have been recognizedpatents与动词examine是被动关系,此处是过去分词表被动在句中作定语。故选C.

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