【题目】 Not all the patents________ have been recognized.
A. to be examined B. being examined
C. examined D. having been examined
在线课程【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 recognized，patents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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