《国务院关于预防煤矿生产安全事故的特别规定》的要求，()对预防煤矿生产安全事故负主要责任。

A.煤矿企业辖区政府主要负责人

B.煤矿企业主要负责人

C.煤矿企业安全生产管理人员

D.煤矿企业生产现场指挥人员

Could you tell me ________ last night?[ ]

A.what you were doing                  

B.what were you doing

C.what you are doing                  

D.what are you doing