Over10,000runnersjoinedahalfandaminimarathonsinXianlin...

问题详情：

 Over 10, 000 runners joined a half and a mini marathons in Xianlin, Nanjing ________ May 7, 2017.

A. in                  B. on                   C. at                    D. by

【回答】

B    

知识点：介词和介词短语

题型：选择题