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15.Advertisements based on these facts            in newspapers and magazines but they didn't help much.(  )
A.had printedB.had been printed
C.have been printedD.was printed

分析 根据这些情况制定的广告词已刊登在了报纸和杂志上,但是它们的效果并不大.

解答 答案:C
分析句意可知,此处表示过去的动作或状态对现在产生的影响或造成的后果,即:大家都已经看到了刊登在报纸和杂志上的广告词,所以这里应使用现在完成时;故选C.

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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