过去分词是 became
become 是动词 become 的过去分词，表示“成为”的意思。例如：
– She became a teacher after completing her degree.
– The new policy will become law next month.
become 还可以表示状态或过程的变化。例如：
– She has become tired after working long hours.
– The company has become a major player in the industry.
在口语中， become 还可以表示“变得”的意思。例如：
– He became angry when he heard the noise.
– Can you become more organized before the meeting?
总结起来， become 是动词 become 的过去分词，它表示“成为”的意思，并且常用于表示状态或过程的变化。
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