企业无法可靠区分研究阶段和开发阶段支出的，应将其所发生的研发支出全部资本化计入无形资产成本。()

—What did Tom do last Friday night?            

—He did nothing. He just____  on the street.        [ ]

A.ran after a dog  

B.played football  

C.hung out  

D.went shopping