.Was it through Mary , ____ was working at a high school , _____ you get to know Tom ?

A．who, who

B．that, which

C．who, that

D．who, which

可先采用按摩和局部抗生素滴眼等保守治疗1～2周后无效可行泪道探通的病为（）

A.泪小点完全膜闭

B.泪点缺如

C.鼻泪管阻塞

D.先天性泪囊膨出

E.泪点和泪管完全缺如