单选题 Peter has planned to ＿＿＿＿＿＿＿＿＿＿＿ some money every month so that he can buy a used car next year. 的答案

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题目内容：
Peter has planned to ＿＿＿＿＿＿＿＿＿＿＿ some money every month so that he can buy a used car next year.
题目选项

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