衣原体肺炎的临床特点是()

A.起病缓慢，多有上感症状

B.频繁间断咳嗽，一般不发热

C.可有气促，肺部可闻及湿啰音

D.病理改变特征为间质性肺炎

E.以上都不是

Twenty years _____ passed since I came to this school, but I feel twenty years _____a short time in my life.

A．has; are

B．have; is

C．has; is

D．have; are