— Can you tell me________?
— He is in the library.
A:where was Jack
B:where Jack was
C:where is Jack
D:where Jack is
如下表所示,这与北魏孝文帝的哪一项内容有关( )
鲜卑族姓
汉族姓
拓跋
元
步六孤
陆
独孤
刘