The third women’ s conference ______ in the USA this summer talked about women’s rights in the developing countries.A.to be sponsoredB.sponsoringC.sponsoredD.was sponsored
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C解析sponsor用作及物动词，意思为“发起；举办；主办”， conference与sponsor为被动关系，根据句子的时态又知这是一个完成的动作，所以用过去分词作后置定语，相当于定语从句that was sponsored。若选D项构成定语从句，需在was sponsored前加上that。