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He has spent as much money as he can ___ his poor son. 这里应用t

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He has spent as much money as he can ___ his poor son. 这里应用to save or saving ? 请说明理由?
用saving 可以看成是 spend money doing sth.
而如果用不定式呢,做目的状语.
但问题是,有没有spend money to do sth 这个结构?
He has spent as much money as he can ___ his poor son. 这里应用t
没有 spend后面能跟三个介词 第一个spend 时间/金钱on sth
第二个spend时间金钱in doing sth in一般情况省略不要
第三个spend时间with sb 和某人度过一段时间