ChinesePresidentXiJinpingandhiswifePengLiyuansetoffont...

問題詳情：

 Chinese President Xi Jinping and his wife Peng Liyuan set off on their first state visit to Russia

 　           March 22, 2013.

   A. in       B. on    C. by   D. at

【回答】

B

知識點：介詞和介詞短語

題型：選擇題