It is a mon practice in the USA that one needs to make a(n) _ before seeing a doctor.
A. difference
B. impression
C. appointment
D. decision
网友回答
A. difference
B. impression
(答案→)C. appointment
D. decision
解析:句意:在美国看医生之前需要预约是常规惯例。make an appointment约定,预约。所以选C。