非谓语中过去分词与不定式

非谓语中过去分词与不定式
hearing the 2009 world winter university games ( ) open,all the people in the harbin sports center gym burst into cheers.
A declare
B declared
C declaring
D to be declared
过去分词不是应该是动作已经完成么?我觉得是将要在这里召开,应该是动词不定式的被动么,