— I didn't tell my parents the secret yesterday. 

— But you _____. [ ]

A. ought to do

B. ought to

C. should

D. ought to have

下列人员人井必须携带便携式甲烷报警仪或数字式甲烷报警矿灯（）。

A．矿长

B．矿技术负责人

C．采掘区队长

D．水泵司机