单选题 A(n) ＿＿＿＿＿＿ is a sequence of code in a program eｘecuted repeatedly,either fro a fixed number of times or until a certain condition is met. 的答案

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题目内容：
A(n) ＿＿＿＿＿＿ is a sequence of code in a program eｘecuted repeatedly,either fro a fixed number of times or until a certain condition is met.
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