问题描述：
China's sports start Yao Ming and Liu Xiang ___ Goodwill Ambassadors for Shanghai.
A has been named B have been named C has named D have named
选哪个为什么,谢谢,顺道翻译
A has been named B have been named C has named D have named
选哪个为什么,谢谢,顺道翻译
问题解答：
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