问题
                    
YOG (青奥会) comes _____summer— Yes. And the 2nd YOG starts in Nanjing _____August 16.
                            A:in; on
B:on; on
C:at; on
D:on; in;
                        
                        B:on; on
C:at; on
D:on; in;
正确答案是:
                        