By the first day of August, 2007, the PLA ________ for eighty years.

A．foundedB．has founded
C．has been foundD．had been founded

D

解析試題分析：句意：到2007年八月的第一天，中國人民解放軍已經建立了八十年了。結合語境可知本句描述的是過去某時之前已經完成的動作，故用過去完成時態(tài)。主語是被建立的對象，故用被動語態(tài)，選D。
考點：時態(tài)及語態(tài)
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結合語境來判斷句子的時態(tài)。語態(tài)的判斷主要是確定句子主語與謂語動詞的關系。如果是主動關系則用主動語態(tài)，反之如果是動賓關系，則用被動語態(tài)，尤其要注意一些特殊動詞的用法。

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