题目内容

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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