单选题
China's sport stars Yao Ming and Liu Xiang ______ Goodwill Ambassadors(亲善大使)for Shanghai.
A、
[A] has been named
B、
[B] have been named
C、
[C] have named
【正确答案】
【答案解析】
[解析] 此题考查动词时态。since是现在完成时的时间状语标志。
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