All his attention________on the computer game he was playing,so he even didn't notice his mother

enter the room. [ ]

A. has been fixed

B. was fixing

C. was fixed  

D. fixed

世界上第一个保护文学、艺术和科学作品的国际公约是（）

A.《专利合作条约》

B.《巴黎公约》

C.《伯尔尼公约》

D.《罗马公约》