下列选项中哪项不属于中级人民法院一审管辖的案件( )

A．海关处罚案件

B．专利局确认发明专利权的案件

C．版权局确认著作权的案件

D．影响较大的共同诉讼案件

We were having a meeting ______ suddenly someone knocked at the door. [ ]

A. because

B. when

C. as

D. while