一道英语老题There have been several new events ＿＿＿ to the program

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一道英语老题There have been several new events ＿＿＿ to the program
There　have　been　several　new　events＿＿＿　to　the　program　for　the　2008Beijing　Olymoic　Games．
答案是added.我的疑问1：为什么不能用to add?(for us) to add
2：如果改为we have several new events ____ to　the　program
此处填什么?added?to add?或是两者皆可?
动词不定时做定语,和过去分词做定语有点搞混了.

现在要区分的是to add 和added的区别
很显然 to add 是未发生的目的性的表示
而added 是已发生的完成时
第一句there have been 明显是完成时的表现
只能用added

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