—Have you ever seen a tiger in the wild?

—Yes. I saw_________when I visited the National Park in Guiyang.[ ]

A. which            

B. it

C. one

D. that

患儿7岁，右下第一恒磨牙萌出2／3，颊沟深龋洞．牙龈覆盖颊沟l／2，应怎样治疗

A．不作处理完全萌出后备洞充填

B．作颊沟窝沟封闭

C．去腐．氧化锌丁香油糊剂暂封

D．龈上龋洞备洞充填

E．推下或切除牙龈，备洞充填