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 题目和参考答案——青夏教育精英家教网—

题目内容

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】

【解析】

试题分析：句意：到2007年8月1日为止，中国人民解放军已经成立了80年了。句中有by+过去的时间，表示到…为止，句子用过去完成时，found成立，故选D

考点：动词的时态

点评：动词的时态是学习英语过程中非常重要的知识。现在完成时表示动词在过去发生对现在造成的影响。现在完成时往往和already,yet,for+一段时间，since+点时间的时间状语连用。过去完成时表示动作发生在过去的过去，句子中强调过去的动作对现在造成的影响。

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