He knew nothing about the matter, but he talked as if he __it.

A．knows

B．knew

C．had known

D．would know

下列那项为谵妄状态

A．可见于癔症发作
B．表情淡漠，回答理性，但迟钝
C．定向力和自知力障碍，躁动不安，与外界不能正常接触，常有幻觉和错觉
D．思维异常活跃，好说、好动、但意识清楚
E．无意识障碍，症状多而阳性体征少