单选题 In a way, Iˊm glad youˊve made the mistake, for it ＿＿＿＿＿＿＿ as a warning to you. 的答案

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题目内容：
In a way, Iˊm glad youˊve made the mistake, for it ＿＿＿＿＿＿＿ as a warning to you.
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