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问题: 翻译一个句子

It is difficult for us to learn a lesson in life ________ we’ve actually had that lesson. [2007 天津卷]
A. until B. after C. since D. when

解答:

答案选 A

不吃一堑,难长一智。

直译:我们只有在生活实际经受了教训,才吸取那样的教训。