The man I _____ yesterday is Mr. White. [ ]

A. paid a visit

B. had a talk

C. dropped in

D. came across

目前预防艾滋病最重要的措施是（）

A.及时隔离HIV感染者

B.充分理解和关心艾滋病患者以免其隐瞒病情

C.提高公众认识切断传播途径

D.易感者接种HIV疫苗

E.应用高效价免疫球蛋白保护易感者