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8月1日為止，中國(guó)人民解放軍已經(jīng)成立了80年了。句中有by+過(guò)去的時(shí)間，表示到…為止，句子用過(guò)去完成時(shí)，found成立，故選D
考點(diǎn)：動(dòng)詞的時(shí)態(tài)
點(diǎn)評(píng)：動(dòng)詞的時(shí)態(tài)是學(xué)習(xí)英語(yǔ)過(guò)程中非常重要的知識(shí)�，F(xiàn)在完成時(shí)表示動(dòng)詞在過(guò)去發(fā)生對(duì)現(xiàn)在造成的影響�，F(xiàn)在完成時(shí)往往和already,yet,for+一段時(shí)間，since+點(diǎn)時(shí)間的時(shí)間狀語(yǔ)連用。過(guò)去完成時(shí)表示動(dòng)作發(fā)生在過(guò)去的過(guò)去，句子中強(qiáng)調(diào)過(guò)去的動(dòng)作對(duì)現(xiàn)在造成的影響。

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