静脉导管留置时间过长易发生感染，一般导管留置时间不宜超过
A．1天
B．2天
C．3天
D．4天
E．5天
参考答案：C
下列肝胆病中，哪项不出现眩晕症状
A．胆郁痰扰
B．肝阳上亢
C．肝气郁结
D．肝血虚
E．肝阴虚
－The train is leaving right now, but David hasn't arrived yet.
－Well, he said he here on time. [ ]
A. came
B. will be
C．would come
D. can be
