问题描述：
She made a difficult decision:to send him to a boys' boarding school.
可以改为：
She made a difficult decision:send him to a boys' boarding school.
或者
She made a difficult decision:sending him to a boys' boarding school.
可以改为：
She made a difficult decision:send him to a boys' boarding school.
或者
She made a difficult decision:sending him to a boys' boarding school.
问题解答：
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