【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(yàn)的專利都被認(rèn)可。句中已有謂語(yǔ)動(dòng)詞have been recognized，patents與動(dòng)詞examine是被動(dòng)關(guān)系，此處是過(guò)去分詞表被動(dòng)在句中作定語(yǔ)。故選C.

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