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

A．founded                              B．has founded

C．has been found                         D．had been founded

 

【答案】

D

【解析】

試題分析：句意：到2007年8月1日為止，中國人民解放軍已經(jīng)成立了80年了。句中有by+過去的時間，表示到…為止，句子用過去完成時，found成立，故選D

考點：動詞的時態(tài)

點評：動詞的時態(tài)是學(xué)習(xí)英語過程中非常重要的知識�，F(xiàn)在完成時表示動詞在過去發(fā)生對現(xiàn)在造成的影響�，F(xiàn)在完成時往往和already,yet,for+一段時間，since+點時間的時間狀語連用。過去完成時表示動作發(fā)生在過去的過去，句子中強調(diào)過去的動作對現(xiàn)在造成的影響。

 

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