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20．Lessons learned from the past，_________ forgotten，can serve as a guide for the future．（　　）
A．if everB．if soC．if notD．if possible

分析 從過去所學到的教訓，如果不被忘記，可以指導將來．

解答 答案：C 考查省略句．if not forgotten相當于if they are not forgotten的省略形式．

點評 解答省略句時，要注意分析各種形式省略句的原因，才能正確作答．

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