In the dream Peter saw himself ________ by a fierce wolf, and he woke up with a start.[ ]

A. chased  

B. to be chased

C. be chased  

D. having been chased

我国常规艾滋病病毒（HIV）抗体检测包括初筛试验和确认试验。凡初筛试验结果阳性者必须做确认试验，如确认结果阳性方可诊断为HIV感染。