--- You were out when I went to visit you yesterday.

---Oh, I________ for a friend from England at the airport.

A．was waiting

B．had waited

C．am waiting

D．have waited

恢复期仍能排出病原体的疾病是（）

A.麻疹、水痘

B.结核、钩虫病

C.百日咳、流行性乙型脑炎

D.伤寒、白喉

E.流感、麻疹