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11.With hard work over the past few decades,China         great progress in many fields,specially in high technology.(  )
A.achievedB.has achievedC.had achievedD.is achieving

分析 经过过去几十年的努力,中国已经在许多领域,特别是在高科技领域里,取得了很大的进步.

解答 答案:B
根据句中的时间状语"over the past few decades"可知,此处表达的是过去某一段时间里发生的事情对现在产生的影响或造成的结果,即:中国在许多领域里都取得了很大的进步,所以这里应使用现在完成时;故选B.

点评 本题考查了现在完成时强调"影响性"的用法;做本题时,需要了解现在完成时除了强调动作的持续性以外,它还强调过去的动作对现在产生的影响以及造成的结果;例如:I have already seen the film.我已经看过这部电影了.(对现在的影响是:我知道电影的内容);I have lost my key.我把钥匙弄丢了.(造成的结果是:我进不了门了.)

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