The Centennial Exposition, __ in Philadephia, Pannsylvania, in 1976,celeberated the one-hundredth anniversary of the Declaration of Independence.
A was held
B to be held
C held
D by holding
答案选Ｃ
我发现最近我做语法填空题对句子结构把握不行！这题我的想法是前面是主句，后面是分词后置修饰主语，所以我选的是Ａ，这样是不是不对啊？
谢谢赐教！ | 
