When he ______ the door, he found his keys were nowhere．

A．would open

B．opened

C．had opened

D．was to open

遵纪守法、爱岗敬业、质量为本、真诚守信、急人所难、救死扶伤、文明经商、服务热情是医药行业的（）

A.特点

B.职业守则

C.社会作用

D.职业道德