Our society insists on regular habits, timekeeping and punctuality, and whether we like it or not, ______ we mean to make our way in society, we have to comply ( to act in accordance with a demand, rule, etc.) its demands.

A．whether

B．after

C．if

D．until

医疗事故分为四级是根据（）

A.医疗事故的责任

B.患者病情严重程度

C.患者患病的病种情况

D.医疗事故的定性

E.对患者人身造成的损害程度