问题补充：
a chance, we are bound to visit the Shanghai EXPO.
A. To be given
B. Given
C. Giving
D. Having given
答案：
A. To be given
(答案→)B. Given
C. Giving
D. Having given
解析：考查非谓语动词。句意：给我们一个机会，我们一定要参观上海世博会。过去分词表示被动的动作，和句子主语是动宾关系，故选B。
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