I've learned______ ,no matter what happens and how bad_______ seems today,life goes on and it will be better tomorrow.     [ ]

A. that ; it                            

B. it ; that      

C. it;it                              

D. that;that

巡视监控民警对单独关押的在押人员，应当做到（）。

A、对监控图像进行跟踪观察

B、发现突发情况，立即通知值班民警和所领导

C、增加巡视密度

D、每30分钟记载一次动态情况