寒者热之适用的病证是（）

A.阳偏盛

B.阳偏衰

C.阴偏盛

D.阴偏衰

E.阴阳两虚

My father     __     my uncle when he went to Shanghai on business.           [ ]

A. dropped off  

B. dropped into  

C. dropped by    

D. dropped out