单选题 It is so generous ＿＿＿＿＿＿＿＿ such a big sum of money to the school. 的答案

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题目内容：
It is so generous ＿＿＿＿＿＿＿＿ such a big sum of money to the school.
题目选项

for the company to donate

of the company to donate