I ______ two tickets for the football match. Would you like to go with me? [ ]

A. bought

B. buy

C. had bought

D. have bought

甲单位接受乙单位委托的研究任务完成一项发明创造。在双方事前无协议约定的情况下，该成果的( )。

A．专利申请权应属于甲单位

B．专利申请权应属于乙单位

C．专利申请权应属于甲乙两单位共同拥有

D．专利申请权归两单位中先提出专利申请者