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【題目】 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】

試題分析：句意：并不是所有被檢驗的專利都被認可。句中已有謂語動詞have been recognized，patents與動詞examine是被動關系，此處是過去分詞表被動在句中作定語。故選C.

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